thymus cell count thymus total cell count 2013-10-16T13:25:11Z CMO:0001842 JSmith Measurement of the entire number of cells in the thymus without regard to the type of cell, i.e. including cells of lymphoid origin and stromal 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. clinical_measurement_ontology