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{{Short description|Repository of scholarlyfreely manuscriptsaccessible thatbiomedical arejournal free to readarticles}}
{{ infobox bibliographic database
| title = PubMed Central
'''PubMed Central''' ('''PMC''') is a free [[digital repository]] that archives [[open access]] full-text scholarly articles that have been published within thein [[biomedical]] and [[life sciences]] journal literaturejournals. As one of the major research databases within the suite of resources that have been developed by the [[National Center for Biotechnology Information]] (NCBI), PubMed Central is much more than just a document repository. Submissions intoto PMC undergoare an indexingindexed and formattingformatted procedure which results infor enhanced [[metadata]], [[medical ontologies|medical ontology]], and unique identifiers which all enrich the [[XML]] structured data for each article on deposit.<ref>{{cite journal | doi = 10.4242/BalisageVol6.Beck01 | title=Report from the Field: PubMed Central, an XML-based Archive of Life Sciences Journal Articles | journal=Proceedings of the International Symposium on XML for the Long Haul: Issues in the Long-term Preservation of XML | volume=6 | last1 = Beck | first1 = Jeff | name-list-format = vanc | year=2010 | isbn=978-1-935958-02-4 }}</ref> Content within PMC can easily be interlinkedlinked to many other NCBI databases and accessed via [[Entrez]] search and retrieval systems, further enhancing the public's ability to freely discover, read and build upon this portfolio ofits biomedical knowledge.<ref>{{cite book|url=|title=PubMed Central |first1=Chris |last1=Maloney |first2=Ed |last2=Sequeira |first3=Christopher |last3=Kelly |first4=Rebecca |last4=Orris |first5=Jeffrey |last5=Beck | name-list-format = vanc |date=5 December 2013|publisher=National Center for Biotechnology Information (US)}}</ref>
PubMed Central is very distinct from [[PubMed]].<ref>{{cite web |url= |title=MEDLINE, PubMed, and PMC (PubMed Central): How are they different?|author=|date=9 September 2019|}}</ref> PubMed Central is a free digital archive of full articles, accessible to anyone from anywhere via a web browser (with varying provisions for reuse). Conversely, although PubMed is a searchable database of biomedical citations and abstracts, the full-text article physically resides elsewhere (in print or online, free or behind a subscriber [[paywall]]).
{{As of|2018|12}}, the PMC archive contained over 5.2 million articles,<ref>"Openness by Default", ''Inside Higher Ed'', 16 January 2017.</ref> with contributions coming directly from publishers or authors depositing their own manuscripts into the repository per the [[NIH Public Access Policy]]. OlderEarlier data shows that from Jan 2013 to Jan 2014 author-initiated deposits exceeded 103,000 papers during thisa 12-month period.<ref>{{cite web|url=|title=NIHMS Statistics|author=|date=|}}</ref> PMC also identifies about 4,000 journals which now participate in some capacity to automatically deposit their published content into the PMC repository.<ref>{{cite web|url=|title=Home - PMC - NCBI|author=|date=|}}</ref> Some participating publishers will delay the release of their articles on PubMed Central for a set time after publication, this is often referred to as an "embargo period", and can rangeranging from a few months to a few years depending on the journal. (Embargoes of six to twelve months are the most common.) However, PubMed Central is a key example of "systematic external distribution by a third party"<ref>{{cite web |url= |title=Author rights: what's it all about |first=Noureddine |last=Ouerfelli | name-list-format = vanc }}</ref> which is still prohibited by the contributor agreements of many publishers.