[Change in the reaction of circulating colony forming units to ACTH in thymectomized mice]

It has been discovered that unlike animals with the intact thymus, thymectomized adult (CBA X C57B1)F1 mice did not demonstrate any reduction in the number of circulating colony-forming units (CFUs) induced by the elevated concentrations of endogenous glucocorticoids 2 weeks to 5.5 months following operation. It is assumed that the effect of glucocorticoids on CFUs is mediated by the T1 lymphocyte subpopulation.