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March 22, 2022

New PMC Website Design is Live!

We have launched a fresh look and feel to the PubMed Central (PMC) website, which marks the first step of an ongoing modernization effort. Now when you visit PMC’s website, you will see:

  • a redesigned and reorganized homepage
  • easy-to-navigate help documentation
  • a similar look and feel between features in PMC and PubMed
  • a streamlined article display

See our post in NCBI Insights for more details about the update, and please continue to provide feedback through the green “Feedback” button in the lower right-hand corner of the PMC website.

February 24, 2022

Public Access in PMC Update

In 2021, PubMed Central (PMC) continued to grow and evolve in its role as a repository for research support by the National Institutes of Health (NIH) and other partner funding agencies. Around 1.3 million articles have been made publicly accessible in PMC under the NIH Public Access Policy; and the volume of NIH-supported articles added to PMC with associated data content continues to increase annually (59% of articles in 2020 included supplementary material and/or a data availability statement vs. 27% in 2009). Other recent activities include:

Over the last year, PMC has also continued to pilot the curation and ingest of NIH-support preprints reporting COVID-19 research. There are now over 3,000 preprint records discoverable in PMC, accelerating and expanding discovery of NIH research.

September 21, 2021

New Directories and File Packages for Bulk Retrieval of the PMC Article Datasets

[Story Updated February 25, 2022]

PubMed Central (PMC) has made significant improvements to the bulk retrieval of two of the PMC Article Datasets from our FTP service. The improvements were made to bulk packages which include metadata and full text of articles in XML or plain text formats for the PMC Open Access (OA) Subset and the Author Manuscript Dataset, which combined encompass more than half of the 7 million articles in PMC. To improve the usability of these two datasets, PMC has redesigned the bulk download directory structure and file packages on our FTP service. The new structure includes:

  • baseline packages that contain all articles available in PMC as of the baseline date for each respective dataset or grouping; and
  • daily incremental packages for each respective dataset or grouping that only contain articles that are new to the dataset or that have been updated since the baseline or previous incremental file was created.

The PMC Open Access Subset bulk packages have been divided into three groups based on available license terms:

  • Commercial Use Allowed – CC0, CC BY, CC BY-SA, CC BY-ND licenses;
  • Non-Commercial Use Only – CC BY-NC, CC BY-NC-SA, CC BY-NC-ND licenses; and
  • Other – no machine-readable Creative Commons license, no license, or a custom license.

The baseline packages for each of these PMC Open Access Subset usage groups and for the Author Manuscript Dataset have been further divided by PMCID range (e.g., a package with PMC004XXXXXX in its name means that any appropriate articles with PMCIDs falling between PMC4000000 and PMC4999999 are included in the package).

The previous bulk download directories and packages were moved to a new temporary location in December 2021 and will be deleted March 30, 2022. Please begin transitioning to the new directories and packages. This change does NOT impact the individual PMC Open Access Subset article directories and packages on the PMC FTP service, those will remain unchanged. Please also note that the datasets discussed in this update are also now available for retrieval and computing in the cloud.

See the PMC FTP Service page for more details. Please send your feedback and share more about how you are using the PMC Article Datasets to pubmedcentral@ncbi.nlm.nih.gov.

June 14, 2021

PMC Labs is here – Let Us Know What You Think!

[Update March 14, 2022: On March 21, 2022, we will be releasing an updated PMC website design, which has been in development on PMC Labs since June. Please see NCBI Insights to learn more.]

NCBI is at work on a PMC update aimed at creating a more modern and accessible user experience. The first phase of this work is now available on PMC Labs, https://www.ncbi.nlm.nih.gov/labs/pmc, for you to explore and provide feedback. See our post on NCBI Insights for details about key features in PMC Labs and more about our plan for updating the site.

Trying Out PMC on Labs

We encourage you to explore the site and provide feedback. Buttons on the lower right-hand side of the screen make it easy to provide feedback or navigate back to the current PMC site.

To return to the PMC website after visiting PMC on Labs, click the red “Exit PMC Labs” button or the link in the banner at the top of the page.

June 15, 2020

NIH Preprint Pilot Launched

On June 9, 2020, NLM launched the NIH Preprint Pilot. During the pilot, NLM will make preprints resulting from research funded by the National Institutes of Health (NIH) available via PubMed Central (PMC) and, by extension, PubMed. The pilot aims to explore approaches to increasing the discoverability of early NIH research results. The pilot will run for a minimum of 12 months. Lessons learned during that time will inform future NLM efforts with preprints.

To learn more about the pilot, see:

To find preprints in PMC, you can search: preprint[filter]. You can exclude preprints from search results by using the Boolean NOT, e.g., covid-19 NOT preprint[filter]. For additional information on filtering preprints in PMC and PubMed see the FAQ.

Regular updates on the pilot status will be posted to the NLM Technical Bulletin. We encourage you to send your feedback to pmc-preprints@ncbi.nlm.nih.gov.

March 26, 2020

PMC Collaborating with Publishers in Response to COVID-19 Public Health Emergency

On March 13, 2020, the National Science and Technology Advisors from a dozen countries, including the United States, called on publishers to voluntarily agree to make their COVID-19 and coronavirus-related publications and associated data immediately accessible in PubMed Central (PMC) and other appropriate public repositories to support the ongoing public health emergency response efforts.

For more information on which publishers have responded to this call and how to discover COVID-19 and coronavirus-related publications in PMC, see the main COVID-19 Initiative page.

A FAQ is also available. If you have questions not addressed in the FAQ, please contact pmc-phe@ncbi.nlm.nih.gov.

You can learn more about how this initiative fits into the wider NLM response to the current public health emergency in Dr. Patti Brennan’s post, “How Does a Library Respond to a Global Crisis?

July 31, 2019

PMC Tagging Guidance for Peer Review Documents Now Available

Peer review documents, including review reports and editor decision letters, are increasingly being published along with the articles they review. This practice is intended to make the publishing process more transparent. To support these efforts, PMC’s Tagging Guidelines have been updated to include the tagging of peer review documents. NLM encourages PMC-participating publishers, journals, and data providers to review this guidance. Please contact us at pubmedcentral@ncbi.nlm.nih.gov if you have any questions.

February 04, 2019

Unique Identifiers for Supplemental Material

PMC has updated the Associated Data box to display unique identifiers assigned to
supplemental material files by the publisher when available (e.g., DOI; see PMC6351104). In cases
where the publisher has not assigned a unique ID to a supplemental file, NLM will generate
and display a Globally Unique Identifier (GUID; see PMC6351564). This update
aims to support the reporting of datasets as well as the citation and discovery of this
content.

Publishers that are interested in supplying unique IDs for supplemental material files with
their PMC submissions should visit the Tagging Guidelines.

January 14, 2019

Open Access Subset FTP Clean Up

On March 18, 2019, PMC will no longer provide bulk packages of Open Access (OA) Subset text
and XML at the top level directory of the FTP Service. These files were superseded in August
2016 by the Commercial Use and Non-Commercial Use bulk packages located in the oa_bulk
subdirectory. One set comprises articles that may be used for commercial purposes (the
Commercial Use Collection); the other contains articles that can be used only for
non-commercial purposes. Anyone planning to use OA subset content for non-commercial
purposes will need to download both “non_comm_use.*.tar.gz” and “comm_use.*.tar.gz” to
access the complete collection. See the Open Access
Subset
page for additional details. Questions should be directed to pubmedcentral@ncbi.nlm.nih.gov.

January 07, 2019

PMC Adds Support for Machine-Readable Clinical Trial Information

Machine-readability of scholarly outputs is critical to supporting large-scale analysis of
the scientific literature. To that end, PMC’s Tagging Guidelines and internal processes have been updated to support the JATS4R recommendations for tagging clinical
trial information. NLM encourages PMC-participating publishers, journals, and data providers
to review this guidance. Please contact us at pubmedcentral@ncbi.nlm.nih.gov if you
have any questions.

November 15, 2018

Discovering Associated Data in PMC

In the NLM Strategic Plan released earlier this year, we noted that “[c]reating efficient
ways to link the literature with associated datasets enables knowledge generation and
discovery.” To that end, PMC is now aggregating data citations, data availability statements
and supplementary materials, as available, in an Associated Data box. This box will only
display on articles that have one or more of these features in the article.

To limit your search to records with an Associated Data box, you can use the new
“Associated Data” facet on the search results page:

We hope that exposing this content in a consistent format and in an easy to find and easy
to access manner, you will more readily find the datasets you need to further accelerate
discovery and advance health. As part of our ongoing commitment to making data
findable, accessible, interoperable, and re-usable (FAIR)
, we encourage you to contact us with your feedback on these
updates and with any other suggestions you may have for improving discovery of related data
in PMC.

October 23, 2018

Open Access Week 2018 and PMC

Collaboration with publishers and funders to ensure the openness and preservation of the
scientific record is one of PMC’s core principles. Open Access Week offers an opportunity to
celebrate some of the recent outcomes of these collaborations:

  • In July 2018, the PMC corpus of publicly accessible articles hit 5 million
    articles.
  • In May 2018, the PMC Open Access Subset
    surpassed the 2 million article mark.
  • The Author Manuscript Collection now includes more
    than 500,000 papers for text mining.
  • The PMC and Research Funder Policy page underwent an
    update in September 2018 to increase transparency around funder support in PMC for
    publishers, authors, and the public.
  • Funder policy support in PMC has been extended to the US Department of Homeland
    Security, in addition to several new US private research funders via the Health Research
    Alliance.

In FY2018 more than 200 new journals committed to archiving their complete contents in PMC,
to be made publicly accessible in 12 months or less.

June 26, 2018

Updated information on journal selection and participation agreements released

PMC has released expanded information about its
selection process for journals that apply for participation. The current review process has
been in place since November 2014 and focuses
on the scientific rigor and editorial quality of each journal that applies to participate in
PMC. Some of the attributes taken into account as part of this process include the article
content, journal policies, language quality, and presentation of content. The same
assessment considerations are used for reevaluation
of currently participating journals
. We encourage you to visit the Journal Selection for PMC page to learn more.

Publishers and journals interested in submitting an application to PMC are also encouraged
to review our updated policies on agreement
types
. These policies provide the eligibility criteria for each type of participation
agreement and should be considered alongside the pre-application requirements.

We hope these updates are informative and look forward to hearing your feedback.

April 18, 2018

Data Filters in PMC and PubMed

Looking for journal articles with associated data sets? New search filters in PMC and
PubMed aim to increase the discoverability of articles with associated data information.

In PMC, users can now search on or append searches with filters to discover articles with
specific types of associated data, i.e., to find

  1. articles with associated supplementary material, use “has suppdata”[filter];
  2. articles that include a data availability or data accessibility statement, use “has data avail”[filter]; or
  3. articles that include data citation(s), use “has data
    citations”[filter]

Alternatively, users can run a search on “has associated data”[filter] to
find all articles with any type of data section described above.

In PubMed, users can now search on or append searches with data[filter] to find articles with related
data links in either the Secondary Source ID field or the LinkOut — Other Literature
Resources field (both located below the abstract). These data links may be to records in
other NLM databases (e.g., GenBank) or external data repositories (e.g., figshare, Dryad).

The provision and availability of associated datasets still varies widely from article to
article, but it is our hope that this small step helps improve the discoverability of this
material and supports wider community efforts to advance science in new directions.

March 28, 2018

Article Display Updates

In collaboration with Europe PMC, PMC has rolled out
several updates to our article display in order to enhance the transparency and readability
of the content.

Navigating from the PMC record to the PubMed record has been made easier by the addition of
hyperlinked PubMed IDs (PMIDs) in the upper right-hand corner of article records. Clicking
the PMID link will take you to the corresponding citation record in PubMed.

The PMC Disclaimer link has also been moved out of the Copyright and License information
section for easier discovery and access. This page describes what content is included in PMC
as well as other important NCBI and NLM disclaimer information.

Additionally, two changes have been implemented to improve the functionality of author
names. Users can now click on an author name to view the author’s affiliation(s). Users also
have the option of running a quick author name search in PMC by clicking the linked author
name in “Find articles by

“. In the example pictured above, the search would be
for “Sawyer SL”[Author].

And finally, figures and tables have been moved inline in the article display. By moving
away from the thumbnail display, PMC hopes to make it easier for users to view figure and
table data as they read articles. Users may still click on the figure/table title or “Open
in separate window” (as available) link for a closer look.

We hope these updates improve the overall user experience in PMC and look forward to
hearing your feedback.

References

Screenshots from:

Qiao, Y., Yang, J., Liu, L., Zeng, Y., Ma, J., Jia, J., … Wang, Y. (2018). Successful treatment with pazopanib plus PD-1
inhibitor and RAK cells for advanced primary hepatic angiosarcoma: a case report
. BMC
Cancer, 18, 212. http://doi.org/10.1186/s12885-018-3996-3

Stabell, A. C., Meyerson, N. R., Gullberg, R. C., Gilchrist, A. R., Webb, K. J., Old, W.
M., … Sawyer, S. L. (2018). Dengue viruses cleave
STING in humans but not in nonhuman primates, their presumed natural reservoir
. eLife,
7, e31919. http://doi.org/10.7554/eLife.31919

Both articles made available under a CC-BY license.

January 04, 2018

PMC Year in Review

As we kick off a new year, we wanted to take this opportunity to look back on 2017, which
was a milestone year for PMC.

Last year, PMC made nearly half a million articles available for the public to access with
the support of participating journals, publisher programs, and research funders. Also, in
addition to expanding support for public access to
research results
and the linking of those
results to the underlying dataset(s)
, PMC released several other policy and resource
updates. These include:

  1. Clearer statement of scope for PMC (see also the updated
    entry in the NLM Collection Development Manual for “Journals”);
  2. Guidance for journals on reapplying to PMC;
  3. Policy statements on the scientific, editorial, and
    technical standards for PMC
    (including details on the journal reevaluation process),
    the supply of back content, the eligibility of
    non-English language journals, and the maintenance of publishing schedules;
  4. Production data requirements for PMC-participating
    journals; and
  5. Major update to the PMC Article
    Previewer
    , a tool that allows publishers to see or “preview” how articles will
    appear in PMC and resolve data problems prior to submission.

In September, NLM recognized the achievements to date in the Wellcome Trust and NLM Biomedical Journal
Digitization project, which has added a dozen new historical titles and more than a half
million pages to the PMC archive. The PMC archive now includes content from as far back as
the late 18th century.

Many thanks all our participants and users for a wonderful year!

December 18, 2017

PMC Canada Status Update

PMC Canada, sponsored by the Canadian Institutes of Health Research (CIHR), with
operational support provided by the National Research Council (NRC), has been a valued
partner in the PMC International network since 2009. CIHR and
NRC have now notified NLM of their decision to permanently take PubMed Central Canada (PMC
Canada) offline on February 23, 2018. Details of this decision are available on the PMC Canada website.

The decision to decommission PMC Canada does not affect the status or operations of NIH’s
PubMed Central (US) or Europe PubMed Central. PMC Canada content will remain in the PMC
archive and be publicly searchable on NLM’s PubMed Central (US) and through Europe PMC. CIHR researchers who publish in journals that
deposit their articles directly into NIH’s PubMed Central or deposit manuscripts co-funded
with current PMC-participating funders will continue to be considered in compliance with the
Tri-Agency Open Access Policy on Publications.

NIH and NLM have appreciated our cooperation with CIHR and NRC over the last several years
and will continue to identify new opportunities to work together to support open access and
research excellence.

October 30, 2017

Updated guidance on data deposit and linking in PMC

In response to the growing interest in the availability of data associated with articles,
PMC is reviewing current practices around data and seeking feedback on how to best serve the
data needs of the research community.

As part of these efforts, the PMC policy statement on
supplementary data
was recently updated to more clearly articulate the requirement
that any supplementary data (images, tables, video, or other documents / files) that are
associated with an article must be deposited in PMC with an article. The search filter “has
suppdata[filter]
” can be used in PMC to discover records with associated supplementary
data files.

In addition to providing supplementary data with an article, NLM is also encouraging
journals and authors to make research data available in a public repository and include the
relevant data citation(s) in the paper. Guidance for PMC data providers on tagging data
citations is available in the Tagging
Guidelines
. This guidance is based on the JATS4R recommendations on data citations.

Starting this month, the NIH Manuscript Submission (NIHMS) system will also accept deposits
of small datasets accompanying deposits of funded author manuscripts for inclusion of PMC.
(Guidance for authors is available in the NIHMS FAQ.)

If you have suggestions on future directions in data for PMC to consider, please let us
know at pubmedcentral@ncbi.nlm.nih.gov.

August 28, 2017

PMC Continues to Expand its Role as a Repository for Federally and Privately-funded
Research

Since March 2016, the NIH
Manuscript Submission (NIHMS) system
has added support for researchers from the
following federal agencies to deposit in PMC any manuscripts that fall under the agency’s
public access policy:

  • Assistant Secretary for Preparedness and Response (ASPR/HHS; intramural only at this
    time)
  • Environmental Protection Agency (EPA; intramural only at this time)
  • National Aeronautics and Space Administration (NASA; intramural/civil servants and
    grantees)

Manuscript deposit support for all Administration for Community Living (ACL/HHS)
researchers will be available in NIHMS by October 2017 and for Department of Homeland
Security researchers in early 2018.

Additionally, the Bill & Melinda Gates Foundation Open Access Policy now requires their
grantees to make their published research results available in PMC immediately upon
publication under a Creative Commons Attribution (CC-BY) license. Manuscript deposit support
is not provided in NIHMS for Gates-funded researchers; rather the final published version of
any Gates-funded article is to be deposited directly to PMC by the publisher or a
funder-supported data provider without author involvement. More information on this open
access policy is available on the Gates Foundation website.

PMC will continue to update the list of participating funding agencies at Public Access and PMC as support is implemented.

January 19, 2017

PMC Bulk Download via FTP is Now Using New Naming Conventions

A large-scale update of the file names used for articles available via the PMC FTP service for bulk download was undertaken in early January
2017. The new file naming convention is PMCID-based (e.g., PMC4855680.tar.gz) rather than
being built from article citation data (i.e., journal abbreviation_pub
date_volume_issue_page). This update was made following user reports that the previous
naming convention was resulting in missing contents in cases where citation data was
duplicated across multiple articles. The new convention will ensure that file names are
unique and that the corpus available via the FTP service is complete.

August 17, 2016

New Search Result Filters and Updated Reference List Display

As of August 2016, PMC is home to four million articles! To make this wealth of
full-text content easier to navigate, PMC has rolled out a few updates:

1) Search Result Filters
On all search results pages, you will now see filters
(similar to PubMed’s filters) on the left-hand side that allow you to filter your results by
article attributes, publication date, research funder, and search fields. These filters
replace the Limits page and allow you to more readily:

You can now also quickly add articles that are under a 12-month or less embargo in PMC to
your search results by selecting the “Include embargoed articles” filter option under Text
Availability. See the PMC User Guide for
more information on these filters.

2) Reference List Display
Using related article data available in PMC,
articles that cite papers that have been either retracted or named in a Findings of Research
Misconduct issued by the HHS Office of Research Integrity and not yet retracted will now
include a red hyperlink to the relevant notice directly from the article’s reference list.
This update will help users more easily identify post-publication updates to existing
research.

August 01, 2016

FTP service update to improve access to text mining collections

PMC has reorganized its FTP Service site for users interested
in accessing the PMC Article Datasets, which include
the original Open Access (OA) Subset. New top-level FTP directories help users quickly
locate the content available for bulk download that best suits their research needs. These
directories include:

To make it easier for users to identify and comply with the different licenses that apply
to OA articles, new file lists have been created and the file lists for individual OA
articles now include a “license-type” field for each article. Similarly, the bulk packages
of OA article text have been divided into two sets. One set comprises articles that may be
used for commercial purposes (the Commercial Use Collection); the other contains
articles that can be used only for non-commercial purposes. See the Open Access Subset page for details.

To allow regular users to transition to the new arrangement, the previous arrangement of
files and directories will be maintained in parallel for at least four weeks (i.e., until
the end of August 2016).

March 24, 2016

Public Access Expansion and PMC

Last month marked the third anniversary of the White House’s Office of Science and
Technology Policy (OSTP) memorandum directing Federal agencies with more than $100 million
in annual research and development (R&D) expenditures to develop plans for increasing
public access to the results of the research they support, including scholarly publications.
As a result of this directive, in 2015, PMC started providing support as a public access
repository for funding agencies beyond the National
Institutes of Health
(NIH) and Howard Hughes Medical Institute
(HHMI).

As of March 2015, the following additional agencies are using the NIH Manuscript Submission (NIHMS) system to facilitate
the deposit in PMC of peer-reviewed manuscripts that fall under their public access
policies:

  • Agency for Healthcare Research Quality (AHRQ/HHS)
  • Centers for Disease Control and Prevention (CDC/HHS),
  • Food and Drug Administration (FDA/HHS),
  • National Institute of Standards and Technology (NIST), and
  • U.S. Department of Veterans Affairs (VA)

Additionally, the following additional HHS and other federal agencies have announced public
access plans and committed to using PMC as the repository for agency-funded
publications:

  • Administration for Community Living (ACL/HHS)
  • Assistant Secretary for Preparedness and Response (ASPR/HHS)
  • Environmental Protection Agency (EPA)
  • National Aeronautics and Space Administration (NASA)

PMC will continue to update the list of participating funding agencies at Public Access and PMC as these agencies begin implementation of
their policies.

More information about the current status of public access expansion as a result of the
OSTP memo can be found on the White House blog.

January 11, 2016

NIH Author Manuscripts Available for Text Mining

NIH-supported scientists have made over 300,000 author manuscripts available in PMC. Now
NIH is making these papers accessible to the public in a format that will allow robust text
analyses.

You can download the PMC collection of NIH-supported author manuscripts as a package in
either XML or plain-text format at ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/manuscript/. The collection encompasses all NIH
manuscripts posted to PMC that were published in July 2008 or later. While the public can
access the manuscripts’ full text and accompanying figures, tables, and multimedia via the
PMC website, the newly available XML and plain-text files include full text only. In
addition to text mining, the files may be used consistent with the principles of fair use under copyright law.

Please note that these author manuscript files are not part of the PMC Open Access Subset.

The NIH Office of Extramural Research developed this resource to increase the impact of NIH
funding. Through this collection, scientists will be able to analyze these manuscripts,
further apply NIH research findings, and generate new discoveries.

For more information, please visit the PMC author
manuscript collection
webpage.

December 15, 2015

Updated PMC journal review process and minimum requirements

The PMC Overview and FAQ have been updated to
provide more information on the Scientific Quality Review Process for journals that apply to
participate in PMC.

In 2014, PMC implemented a scientific and editorial quality review procedure whereby expert
consultants from outside the National Library of Medicine (NLM) conduct an independent
review of journals seeking to participate in PMC. This was in response to a significant
increase in new publishers and journals applying to participate in PMC, many of which are
unknown to NLM in terms of quality and publishing practices. The independent review, which
was approved by the PMC National Advisory Committee (see minutes from June
10, 2014), follows an assessment by NLM that the journal meets NLM’s criteria for its
collection, as outlined in the Collection Development
Manual
.

PMC also recently updated the minimum requirement on the number of substantive,
peer-reviewed articles needed before a journal can apply to PMC. The new 25-article minimum ensures that the reviewers have a
sufficient amount of content on which to base their recommendation for inclusion in PMC. The
new minimum article requirement takes effect on January 1, 2016. Publishers are encouraged
to use the 25-article minimum as a guideline in the interim when submitting
applications.

November 23, 2015

CC0 Filter Now Available

PMC includes some journals published by US government agencies that make their articles
available under a Creative Commons CC0 (public domain) license. Some other journals also
apply a CC0 license to selected articles in PMC. All these articles may be used and
reproduced without special permission. However, anyone using the material is requested to
properly cite and acknowledge the source.

You may now search for CC0 articles by using special filters in both PMC (cc0 license[filter]) and PubMed (pmc cc0 license[filter]). These filters
are based on license information that is provided to PMC by publishers and encoded as
machine-readable identifiers in the source XML of each article. For more information, see
the FAQ titled How do I search for articles by Creative Commons license? page.

Please bear in mind that these articles, although made available under a CC0 license, may
still contain photographs or illustrations copyrighted by other commercial organizations or
individuals that may not be used without obtaining prior approval from the holder of the
copyright.

February 05, 2015

Full text now available for OA subset articles, in plain text format

In order to facilitate text and data mining for articles in the Open Access Subset, we are
now providing plain text files for those articles on our FTP site. These files contain the
full text of the article, extracted either from the XML source files, or (for those articles
that don’t have XML) the PDF files. Users are directly and solely responsible for compliance
with copyright restrictions and are expected to adhere to the terms and conditions defined
by the copyright holder (see the PMC Copyright Notice).

These text files are bundled in gzipped archives. Note that these files are quite large
(each greater than one gigabyte). They are available for download as:

These files are updated every week, on Saturday.

For more information, see the Bulk Packages of OA
Articles
section of our FTP Service page.

November 18, 2014

Citation Exporter Feature Now Available

PMC is happy to announce the addition of a citation exporter feature. This feature makes it
easy to retrieve either styled citations that you can copy/paste into your manuscripts, or
to download them into a format compatible with your bibliographic reference manager
software.

When viewing an Entrez search results page, each result summary will now include a
“Citation” link. When, clicked, this will open a pop-up window that you can use to easily
copy/paste citations formatted in one of three popular styles: AMA (American Medical
Association), MLA (Modern Language Association), or APA (American Psychological
Association). In addition, the box has links at the bottom that can be used to download the
citation information in one of three machine-readable formats, which most bibliographic
reference management software can import.

The same citation box can also be invoked from an individual article, either in classic
view (with the “Citation” link among the list of formats) or the PubReader view, by clicking
on the citation information just below the article title in the banner.

These human-readable styled citations, and machine-readable formats, will be available
through a public API, and we will be providing more details about that in another
announcement, on the pmc-utils-announce
mailing list
. Please subscribe to that list if you are interested.

March 28, 2014

PMC Advisory Committee Meeting to be Held in June

This year’s PMC Advisory Committee meeting will be held on Tuesday, June 10. The meeting
will take place in the NLM Board room starting at 9:30 am. Stay tuned for further details.

February 24, 2014

Three Million Articles are Now in PMC!!

As of February 21, 2014, PMC became home to three million articles! As listed on
our home page, the content has been provided in part by
1441 full participation journals, 277 NIH Portfolio journals and
2470 selective deposit journals. For related information on PMC
milestones, see these announcements from 2007 and 2010, respectively.

November 18, 2013

PMC Releases New ID Converter

PMC has just released an upgrade to our ID converter, now dubbed the PMCID – PMID -Manuscript ID – DOI Converter. This utility
allows you to start with the unique identifier for an article that is in PMC, and find
additional unique identifiers that may apply to the article. Improvements include support
for DOIs, auto-detection of the ID type based on its format, and enhanced output. It also
provides output in any of several different formats: HTML, XML, JSON, or CSV. This tool uses
an underlying web service, that is also publicly available for those needing programmatic
access to this data. See the ID Converter API
documentation
.

November 18, 2013

New Version of NCBI Handbook is Released

The NCBI Handbook, 2nd Edition was released on November 14 and is now searchable in Bookshelf. The handbook features an updated section on PMC, which includes information on article retrieval, data
processing, and PMC tools and utilities. Other PMC-related literature sections that have
been updated include Bookshelf, the NIH Manuscript Submission System and the NLM
DTD
.

September 04, 2013

New Version of PubReader is Released

PMC has recently released an updated version of its PubReader
view. The new version (1.2) includes a “search this page” feature
that allows you to find specific terms within the article. The latest source code is also
available from the GitHub
repository
.

August 05, 2013

Search for Open Access Articles by License

You can now search for Open Access articles that have certain types of licenses, by using
special filters in both PMC and PubMed. These filters are based on license information that
is provided to PMC by publishers and other content providers, as encoded by machine-readable
identifiers in the source XML of each article. For more information, see our FAQ titled How do I search for articles by Creative Commons license?.

July 17, 2013

JATS-Con 2013 Program is Now Available

JATS-Con is a conference for users of the
Journal Article Tag Suite, that is, users of any of the “NLM DTDs” or NISO Z39.96. JATS-Con
will take place on the NIH campus in Bethesda, Maryland on October 22 and 23, 2013.

The full program is
now available, as are proceedings from previous years.

There is no charge for the conference; however, space is limited so registration is
required.

You may also sign up for a pre-conference tutorial on October 21, 2013. Details are on the
Tutorial Registration
page.

April 22, 2013

Keep Better Track of PMC Features

PMC has created a new email list for announcements of new or updated tools and utilities to
help you keep better track of improvements to the archive. To find out more information
about the list, or to subscribe, please visit PMC-Utils-Announce.

April 19, 2013

New OA Web Service for PMC

PMC is pleased to announce the new OA web service, designed to allow tool developers an
easier way to find content in the PMC open access subset. Until now, it has not been easy
for outside users to determine which articles in the subset are new or have been updated
recently. Our new OA web service addresses this need. It provides a simple API to allow you
to query the subset, to find PDF or tgz (tarred-gzipped) format files, either by article ID,
or by date/time ranges. More information, along with examples, is available from the
documentation page, at OA Web Service. Your feedback
is welcome; please send it to the PMC Help Desk, at pubmedcentral@ncbi.nlm.nih.gov.

February 01, 2013

KoreaMed Synapse Adds PubReader as a Display Option

KoreaMed Synapse, a digital archive and reference
linking platform of Korean medical journals, is now using NCBI’s new PubReader presentation
style to display their full-text journal articles. KoreaMed’s database of 122 journals now
includes a blue ‘PubReader’ icon for each full-text article. NCBI launched PubReader in
December 2012 as a convenient new way to view
full-text articles in PubMed Central on desktops as well as tablets and mobile devices. In
tandem with the launch, NCBI made the code used to create PubReader freely available on GitHub.

February 01, 2013

PMC Advisory Committee Appoints New Members

As of February 1, 2013, the following new members have been appointed to serve on the PMC
National Advisory Committee: Ms. Sharon Terry of the Genetic Alliance; Dr. C. Victor
Jongneel of the University of Illinois at Urbana-Champaign; Dr. Bevin Engelward of the
Massachusetts Institute of Technology; Dr. Randall Morse of the Wadsworth Center; and Dr.
Adelita Cantu of the University of Texas. For more information, see PMC
National Advisory Committee
.

December 11, 2012

PubReader – A New Presentation Style for PMC

NCBI has developed a new web presentation style called PubReader, which offers you an
easier way to use your Web browser to read the articles in PMC. Designed particularly for
enhancing readability and navigation on tablet and other small screen devices, PubReader can
also be used on desktops and laptops and from multiple web browsers. For more information on
PubReader, see the article in the November-December issue of the NLM Technical Bulletin.

November 05, 2012

UKPMC Rebranded as Europe PMC

With the addition of several European sponsoring agencies, including the European Research
Council, UKPMC was renamed Europe PMC as of November 1,
2012. Europe PMC is an outgrowth and expansion of UKPMC, which was first launched in January
2007 with sponsorship from the Wellcome Trust and several other funders of biomedical
research in the UK. Europe PMC receives all of its final published articles directly from
the U.S. PMC archive. It also accepts and processes author manuscripts of journal articles
funded by the Europe PMC sponsoring agencies and
makes them available to U.S. PMC and PMC Canada. For more information, see PMC International.

August 22, 2012

JATS Becomes NISO Standard

The Journal Archiving Tag Suite(JATS), known formerly as the NLM DTD, has now been
officially adopted as an American National Standards Institute (ANSI)/ National Information
Standards Organization (NISO) standard. According to the press release from NISO, “JATS
provides a common XML format in which publishers and archives can exchange journal content
by preserving the intellectual content of journals independent of the form in which that
content was originally delivered.” For more information, see NISO Publishes Journal Article Tag Suite (JATS) Standard.

July 13, 2012

A Facelift for PMC

PMC has recently undergone another redesign to improve the look and feel and functionality
of the site, featuring more white space, cleaner lines and enhanced navigation on its article, issue, and
journal archive pages. For more information, see the article in
the July-August 2012 issue of the NLM Technical Bulletin.

July 12, 2012

New Version of PMC Help is Released

The PMC user’s guide, PMC Help has been updated to include
new and improved information on navigating the site as well as descriptions and instructions
on using the new search functions, such as Limits and Advanced Search
Builder
. Further updates will also be forthcoming.

March 26, 2012

JATS-Con Dates Announced for 2012!

The third annual Journal Article Tag Suite Conference (JATS-Con) will be held on October 16
and 17, 2012 on the NIH Campus in Bethesda, Maryland. JATS-Con is a conference for users of
the NISO Z39.96 Journal Article Tag Suite: that is, users of any of the NLM DTDs. JATS-Con
is a peer-reviewed conference with a broad range of content on the Tag Suite from the
technical to publishing theory — and the latest news on the Tag Suite. For more information,
see JATS-Con.

February 29, 2012

PMC Advisory Committee Appoints New Members

The following new members have been appointed to serve on the PMC National Advisory
Committee: Martha Bedard, Dean of Libraries at the University of New Mexico; and Lorraine
Haricombe, Dean of Libraries at the University of Kansas and a member of SPARC’s board. The
next meeting of the committee is scheduled for June 19, 2012. For more information, see PMC National Advisory Committee.

July 12, 2011

JATS-Con is Coming!

The second annual Journal Article Tag Suite Conference (JATS-Con) will be held on September
26 and 27, 2011, at the Natcher Conference Center on the NIH Campus in Bethesda, Maryland.
The 2011 conference will feature a host of presenters who will discuss topics ranging from
Best Practices to PMC Tagging Guidelines. For more information on the
conference and the program, see JATS-Con.

June 20, 2011

The PMC 10th Anniversary Video is now on YouTube!

A video celebrating PMC’s first decade is now available for viewing on the NCBI YouTube Channel. The
PMC 10th Anniversary Video can
also be found on the regular YouTube site.

June 14, 2011

PMC Advisory Committee to Meet at NLM

The PMC Advisory Committee will hold its annual meeting at the National Library of Medicine
on Friday, June 17, 2011 from 9:30 am to 3 pm. Four new committee members will be joining
the group, see New Members Appointed to PMC Advisory
Committee
. Presentations will include discussions relating to the NIH Public Access
policy and a viewing of the PMC 10th Anniversary video. For more information, see PMC National Advisory Committee.

May 26, 2011

A Brand New Look for PMC!

PMC has gotten a facelift– or more accurately, an interface-lift! The home page, search
page and other PMC informational pages have all undergone an overhaul, in order to provide
users with easier navigation, enhanced features, and a look and feel that is more consistent
with other recently updated NCBI sites, such as PubMed and Bookshelf. Additional new
features and updates will be coming soon. For more information on navigating the new site,
see the article in
the July-August issue of the NLM Technical Bulletin.

February 28, 2011

Ten Years After: PMC Milestone Featured in

PMC marked its 10th anniversary in 2010 with a celebratory event at its annual Advisory
Committee meeting, held at the National Library of Medicine last June. This milestone event
was recently featured in the February 17th edition of NLM In Focus, in an article NLM
Milestones: The Hits Just Keep on Coming
. For more information on the ten years of
PMC, see the article in the May-June issue of the NLM Technical Bulletin.

February 17, 2011

New Members Appointed to PMC Advisory Committee

Four new members have been appointed to serve on the PMC National Advisory Committee:
Philip Bourne, of the University of California, San Diego; Sophia Colamarino, an independent
consultant in San Francisco; Paul Courant, of the University of Michigan; and Patricia
Thibodeau, of Duke University. Each member will serve a 4-year term. The next meeting of the
committee is scheduled for Friday, June 17, 2011. For more information on the committee, see
PMC National Advisory Committee.

September 14, 2010

A New Look and Feel for PMC’s Public Access Page

The Public Access & PMC page has been redesigned
for greater clarity and usability. In addition to including a list of the FAQs at the top,
the new page features a table illustrating all the ways to find various reference numbers
for an article: the PMID, NIHMSID, and most important, the PMCID, which must be used to
demonstrate compliance in terms of the NIH Public
Access Policy
.

June 25, 2010

PMC Hits Two Million Mark!!

It’s official—PMC has just become home to two million
articles
! The record-breaking article, which came from the American Journal of
Medical Genetics Part B: Neuropsychiatric Genetics,
became publicly available in the
PMC archive on June 23. This new PMC milestone has occurred almost three years to the day
since PMC reached its last one: the one-million article mark in June 2007. See also: PubMed Central Hits One Million
Article Mark
.

June 17, 2010

First-Ever Journal Article Tag Suite Conference (JATS-Con) to be Held in November
2010

PMC is pleased to announce the first of what we hope will be an annual series of
conferences for users of the Journal Article Tag Suite, that is, for users of any of the
“NLM DTDs”. The Journal Article Tag Suite Conference (JATS-Con) is a peer-reviewed
conference that will feature a broad range of content on the Tag Suite—from the technical
components to publishing theory—as well as the latest news on the Tag Suite. The conference
will be hosted by the National Center for Biotechnology Information (NCBI) at the National
Library of Medicine on the NIH campus in Bethesda, Maryland on November 1 & 2, 2010.

For more information on the conference, see https://jats.nlm.nih.gov/jats-con.

Note: There is no charge for the conference; however, space is limited so
preregistration is required.

April 29, 2010

PMC Canada’s Manuscript Submission System Goes Live!

The PMC Canada manuscript submission system
was released on April 28, 2010. The system will enable researchers funded by the Canadian
Institutes of Health Research to deposit their peer-reviewed research publications, in
compliance with CIHR’s Policy on Access to
Research Outputs
.

February 24, 2010

New Members for PMC Advisory Committee

Four new members have been appointed to serve on the PMC National Advisory Committee: Mike
Rossner of Rockefeller University Press, Jan Fassler of the University of Iowa, Ivy Anderson
of the California Digital Library, and Delores Meglio from the Knovel Corporation. Each
member will serve a 4-year term. The next meeting of the committee is scheduled for June 4,
2010. For more information on the committee, see PMC National Advisory
Committee
.

November 16, 2009

New URLs in PMC

PMC recently redesigned its URL format to allow for easier usability as well as consistency
across the NCBI site. To implement this change, we moved the previous site,
www.pubmedcentral.nih.gov, into the NCBI domain as a sub-site. You can
now access the PMC home page at https://www.ncbi.nlm.nih.gov/pmc.

The primary advantage of the new format is to enable the PMC site to become more fully
integrated with other NCBI resources. The new URLs are also more user-friendly—they no
longer include technology-driven terminology, such as CGI script names and file extensions
(Figure 1).

Figure 1—Old URL for Journal Page with CGI Script Name

Instead, note that after the NCBI/PMC address, the URL first identifies the type of
resource, e.g., the PMC journal list, with subsequent identification for a particular subset
of that resource—in this case, the journal number (Figure 2).

Figure 2—New URL for Journal Page with Journal Number

Additionally, you will have greater flexibility in accessing particular types of material
because, in a number of cases, more than one URL can be used for the same resource. In these
instances, one URL is considered to be canonical, or primary; however, using any of the
ancillary URLs for that resource will redirect you back to the canonical one. For example
(see Figure 3), although the first URL, which represents the PMCID, is considered to be the
canonical URL, you may also access the article by using other identifiers, such as the pmid,
doi, or the issn-volume-issue-page (ivip).

Figure 3—Canonical and Ancillary URLs for the Same Full-Text Article

Finally, with the roll-out of these more stable and standardized URLs, as in the table
below (Figure 4), you will also find it easier to modify the web addresses in your browser.
Note that the canonical URL is given first and is in bold; the ancillary URLs are listed
below it.

Figure 4—Table Display of all New URLs

Although the new URLs are firmly in place, please also note that we haven’t completely
discarded the old to bring in the new. If you do use an old URL, it’s not a problem. Your
browser will be redirected to the new location.

October 28, 2009

PMC Now Offers a “Preview” Table of Contents for Embargoed Issues

For any journal issue that has at least one open access or early access article, PMC is now
displaying the table of contents (TOC) in advance of the whole issue becoming available. Not
to worry, though—only those articles specified for early release are immediately viewable in
PMC. As consistent with the terms of access in the journal agreement, the other articles
will only become available on their specified release date, as shown in the TOC below.

The journal’s accessiblity, as indicated on the PMC Journal
list
also has not changed; for example, Plant Physiology’s embargo period is still 12
months. What has changed is that the issues with “preview” TOCs now additionally appear on
the journal’s archive page. Publishers and others can rest
assured, however, that no access terms for any journal have been changed with the unveiling
of this new format.

October 21, 2009

PMC Canada is Launched!

The newest addition to the PMC International effort, PubMed Central Canada has now been made public.
Stay tuned for the launch of PMC Canada’s manuscript submission system later this year.

October 01, 2009

PMC Adds New Page on Public Access

A new page, Public Access & PMC, has now been
added to the About PMC section of the PubMed Central site. “Public Access
& PMC” provides information on the relationship between PMC and the NIH Public Access
policy, including the difference between the NIH Public Access journal list and PMC journal
list. In particular, authors and publishers should find this new site to be a useful
resource.

July 24, 2009

New Search Function Released

You can now find embargoed articles and their corresponding PMCIDs through a recently
released search option in the PMC Entrez database. Using the “Limits” tab, click in the
field, “Show both free and embargoed articles” and refine your search by journal, author,
date, article type, and/or tag term, as needed. Once you’re on the summary page, click on
the “embargoed” tab at the top to find the articles in this category. You can then find the
PMCID and date of availability at the bottom of the article citation, as indicated in the
example below. Note: The PMC search option only includes articles with an initial
embargo of up to 12 months. Articles with an embargo greater than 12 months are not
compliant with the NIH Public Access Policy and will appear in search results only when
the full text is free in PMC.
For more information, see the article in the September-October issue of the NLM Technical Bulletin.

July 06, 2009

PMC Canada to Start in Fall 2009

Canada is soon expected to join the international effort to provide access to health
research through the PMC International network of digital
archives. PMC Canada is the result of a three-way collaborative effort by the National
Library of Medicine (NLM), the Canadian Institutes of Health Research (CIHR), and the
National Research Council’s Canada Institute for Scientific and Technical Information
(NRC-CISTI). Similar to UK PubMed Central, PMC Canada will include most of the health and
life sciences literature available through the U.S. PMC. PMC Canada will also include
research resulting from funding through the Canadian Institutes of Health Research (CIHR).
Components of the new repository will include a bilingual interface as well a manuscript
submission system for CIHR researchers.

June 16, 2009

PMC Advisory Committee Meets at NLM

The most recent meeting of the PMC Advisory Committee was held at
the National Library of Medicine on June 15, 2009. The committee meets at least once a year
and its members are appointed by the NIH Director from the biomedical information
communities and the general public. Dr. Gary Ward, of the Department of Microbiology &
Molecular Genetics at the University of Vermont, has been appointed to serve as Chair of the
Committee through January 2011.

May 19, 2009

New Version of PubMed Central® Journal List Released

PMC released a new and improved journal list on March 31, 2009, after a comprehensive
redesign for greater clarity and organization.

The new design not only combines the full-list and tabbed-list views of the previous
version but also includes some new or updated features to provide users with a greater
overview of the total PMC archive. Looking at this new list, you will find:

  1. An Expanded View of PMC journals that includes NIH Portfolio
  2. Special Collections
  3. A New “Participation Level” Journal Category
  4. Hide/Show Display Option for Predecessor Titles
  5. Article and Journal Search Feature

For more information, see the complete article in the May-June issue of the NLM Technical
Bulletin: https://www.nlm.nih.gov/pubs/techbull/mj09/mj09_pmc_redesign.html