http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed
http://www.nlm.nih.gov/pubs/factsheets/medline.html
Medical literature (Medline) since 1950
MeSH Medical Subject Heading Thesaurus
Unified Medical Language System (UMLS)
Journal Database
LinkOut to journal publishers and other Providers
APC Proxy access to Stanford Publications
ENTREZ: Abstract Neighboring
MyNCBI: Query Storage and Current Awareness