PubMed is a free search engine accessing primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez system of information retrieval.
From 1971 to 1997, MEDLINE online access to the MEDLARS Online computerized database primarily had been through institutional facilities, such as university libraries. PubMed, first released in January 1996, ushered in the era of private, free, home- and office-based MEDLINE searching. The PubMed system was offered free to the public starting in June 1997.
Best Match uses machine learning to rank the results by relevance and present the best matches at the top. View the Best match search information in the right column to see mapped MeSH terms. Click See more to view additional synonyms.
Note that Best Match is a different search. It is not a comprehensive search of PubMed. For comprehensive searches, use a different "Sort" option.
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