PubMedThe National Center for Biotechnology Information's databases, including PubMed (MEDLINE), OMIM, GenBank, PubMedCentral, and the National Library of Medicine's catalog, can be searched by selecting them from Entrez's leftmost drop-down menu. PubMed covers the journal literature in the fields of medicine, nursing, dentistry, veterinary medicine, healthcare systems, pre-clinical sciences, and bioethics.