The National Institutes of Health Public Access Policy requires investigators to submit their NIH-funded final, peer reviewed manuscript to the NIH Manuscript Submission System (NIHMS), for posting in the National Library of Medicine's PubMed Central (PMC) archival database. The manuscript should be submitted immediately after the final date of journal publication and no later than 12 months following publication.
In January 2008, the U.S. Congress passed the Consolidated Appropriations Act. Section 218 states: "The Director of the National Institutes of Health shall require that all investigators funded by the NIH submit or have submitted for them to the National Library of Medicine's PubMed Central an electronic version of their final, peer-reviewed manuscripts upon acceptance for publication, to be made publicly available no later than 12 months after the official date of publication: Provided, that the NIH shall implement the public access policy in a manner consistent with copyright law."
This can be accomplished in several different ways:
To support the submission process, NIH has developed the NIH Manuscript Submission System (NIHMS). This system allows principal investigators to submit manuscripts and supplementary files in many different electronic formats such as TIFF, JPEG, GIF, and PDF.
List the PubMed Central reference number (PMCID) at the end of the already-required full journal citation for the article. If a PubMed Central reference number is not yet available, include the NIH Manuscript Submission system reference number (NIHMS ID) instead.
See the NIH FAQ  for more information, or contact the Reference Desk at 817-735-2070.