(A) Flow cytometry analysis of thymic T-cell populations defined by CD4/CD8 expression in 15-(up) and 16-(down) day old Sham (left) and Adx (right) fetuses. (B) Histograms represent TcRβ expression in thymocytes from 15-(up) and 16-(down) day old Sham (open) and Adx (shadow) fetuses. (C) Thymic populations defined by CD4/CD8 expression in 15- to 16-day-old Adx fetuses from adrenalectomized mothers subcutaneously implanted with an osmotic minipump that reconstituted the corticosterone serum levels in the progeny. Results shown are representative of 3 to 4 experiments.