Definition: Extracts of the thymus that contain specific, but uncharacterized factors or proteins with specific activities; three distinct substances are already known: thymotoxin, thymin and thymosin.
extracts of thymus or thymus fractions containing uncharacterized factors; do not confuse with chemical substances "extracted" from the thymus, as "peptides extracted from the mouse thymus" (
thymostimulin [ TP-1,active thymus factor,thymustimulin ] partially purified thymic extract of calf thymus; increases the percentage of Thy-1-positive cells of mouse spleen & their responsiveness to phytohemagglutinin & Con A stimulation; complex of thermost
