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Testis weights (a) and Leydig cell numbers (b) in rats from the young (6-month-old), chronically stressed and old (21-month-old) groups. Testis weight in rats in the stress group and the old group was decreased significantly compared with testis weights in rats from the young control group (P<0.05) (a). There were no significant differences in Leydig cell numbers among the three groups (b).
