Abbreviations as TopicKiller Cells, NaturalDictionaries as TopicAbbreviationsUnified Medical Language SystemNatural Language ProcessingMEDLINETerminology as TopicAbstracting and Indexing as TopicKiller Cells, Lymphokine-ActivatedDatabases, BibliographicLymphokinesCytotoxicity, ImmunologicInterleukin-2Subject HeadingsPattern Recognition, AutomatedInformation Storage and RetrievalBiological OntologiesDatabases as TopicKiller Factors, YeastReceptors, Natural Killer CellLymphocyte Activation