title: PNAS joins peer-reviewed PubMed Central. Proceedings of the National Academy of Sciences.
authors.forename: C
authors.initials: C
authors.lastname: Macilwain
mesh_terms: D020407:Internet; D009307:National Academy of Sciences, U.S.; D009316:National Institutes of Health (U.S.); D017712:Peer Review, Research; D010506:Periodicals as Topic / Q000639:trends*; D011643:Publishing / Q000639:trends*; D014481:United States