HETEROGENEITY OF THE THYMUS EPITHELIOCYTES AND THEIR ULTRASTRUCTURE IN NEWBORN RATS WITH DISTURBED BALANCE OF GLUCOCORTICOIDS [GETEROGENNOST' ÉPITELIOTSITOV TIMUSA I IKH UL'TRASTRUKTURA U NOVOROZHDENNYKH KRYS PRI DISBALANSE GLIUKOKORTIKOIDOV.] Article Torbek B.E., Iurina N.A. Morfologiia (Saint Petersburg, Russia). Vol. 114. 1998. P. 54-59