[Levels of testosterone and dihydrotestosterone in guinea pig sex canals during embryonic life].

At the undifferentiated stage, testosterone and dihydrotestosterone levels were comparable in sexual ducts of both sexes. An hormonal sexual dimorphism appeared at the time of differentiation: while testosterone rapidly decreased in the female ducts, it considerably increased in those of the male. Testosterone rather than DHT seems to be responsible for the wolffian duct stabilization in the male foetus.