Source:http://linkedlifedata.com/resource/umls/id/C1515139
NCI: Group of lymphocytes. A T-lymphocyte is a white blood cell differentiated in the thymus that possesses highly specific cell-surface antigen receptors. A natural killer cell resembles a T-lymphocyte, but it does not express markers of either T or B cell lineage. Its cytotoxic activity is not antibody dependent.