Orchidectomy affects the monoamine content in rat thymocytes B. Vidic-Dankovic a , K. Radojevic a and G. Leposavic b a Institute of Immunology and Virology bTorlakQ, Belgrade, Yugoslavia; b Faculty of Pharmacy, Belgrade, Yugoslavia Object of study: It has been shown that: (i) orchidectomy influences the intrathymic concentration of monoamines and (ii) some T-cell lines produce catecholamines.