thymocyte count TCR+ thymocyte count 2013-10-23T13:02:27Z CMO:0001845 JSmith T-cell receptor positive thymic lymphocyte count T-cell receptor positive thymocyte count The number of lymphocytes expressing T cell receptor molecules on their surface in a specified sample of thymus tissue. T cell receptor is a transmembrane protein complex that recognizes antigenic peptides bound to Major Histocompatibility Complex (MHC) proteins on antigen-presenting cells as part of cell-mediated immunity. The thymus is the lymphoid organ which is the site of the proliferation, differentiation and maturation of T lymphocytes, and of the production of hormones such as thymopoietin and thymosin which control these processes. clinical_measurement_ontology