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PMC
A free digital archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health (NIH), developed and managed by NIH's National Center for Biotechnology Information (NCBI) in the National Library of Medicine (NLM). Participation by publishers in PMC (PubMed Central) is voluntary, although participating journals must meet certain editorial standards. Although immediate free access to all content is most desirable, a journal may delay release of its full text in PMC for some period of time after publication.
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