[Effect of T-activin on thymus involution in mice].

The effect of T-activin on thymus involution in mice was studied. T-activin in a dose of 1.0 micrograms/mouse was injected into young male (CBA X C57BL)F1 mice weighing 24.0 +/- 2.0 g daily for 20 days. Morphometric analysis of the thymus was made 6 months after the treatment with T-activin was completed. It was found that T-activin induced the suppression of physiological involution of the thymus together with the enhancement of the processes of thymocyte transformation and proliferation.