PubMed Central (PMC) (18), a digital archive of peer-reviewed journals in the life sciences, now contains over 1.8 million full-text articles, growing by 12% over the past year. More than 635 journals, including Nucleic Acids Research, deposit the full text of their articles in PMC. Publisher participation in PMC requires a commitment to free access to full text, either immediately after publication or within a 12-month period. As a consequence of the mandatory NIH Public Access Policy that went into effect on 7 April 2008, PMC is also the repository for all final peer-reviewed manuscripts arising from research using NIH funds. All PMC articles are identified in PubMed search results and PMC itself can be searched using Entrez.
