thymocyte count CD3+ thymocyte count 2020-09-01T18:03:56Z CD3-positive thymocyte count CMO:0003517 The number of thymocytes expressing CD3 molecules on their surface in a specified sample of thymus tissue. The CD3 complex, including five CD3 subunits, binds either TCR alpha/beta or TCR gamma/delta to form the TCR/CD3 complex on the surface of T-cells. 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. VT:0000715 clinical_measurement_ontology slaulede