PubMed Central grew from the online Entrez PubMed biomedical literature search system. PubMed Central was developed by the U.S. National Library of Medicine as an online archive of biomedical journal articles. The full text many of articles is available for free. Some participating journals still charge for access to recent (often the latest 6 months) articles. The Entrez Global Query Cross-Database Search System allows access to databases at the National Center for Biotechnology Information (NCBI) website. ... The U.S. National Library of Medicine (NLM), operated by the U.S. federal government, is the worlds largest medical research library. ...
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{{Template:PMC}} - template for citations to online articles
The journal articles are supplied to PubMedCentral either at the time of publication of the issue, or after a delay of anything from one month to a year or more after publication.
Whether submitted articles are viewable in PubMedCentral or not, it is important that they meet a PubMedCentral standard for completeness and syntactical correctness so that the integrity of the archive is ensured.
The common PubMedCentral DTD means that every article in the archive has its parts (authors, affiliations, major article sections, references, etc.) tagged in exactly the same way, regardless of its source SGML or XML format.
PubMedCentral is a digital archive of life sciences journal literature, developed and managed by the National Center for Biotechnology Information (NCBI) at the U.S. National Library of Medicine (NLM).
With PubMedCentral, NCBI is taking the lead in preserving and maintaining open access to the electronic literature, just as NLM has done for decades with the printed biomedical literature.
PubMedCentral aims to fill the role of a world class library in the digital age.
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