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The cytochrome P450 aromatase (P450arom) is the terminal enzyme responsible for the formation of estrogens from androgens. According to the age, aromatase activity has been measured in immature and mature rat Leydig cells, as well as in Sertoli cells whereas in pig, ram and human the aromatase is mainly present in Leydig cells. In the rat testis, we have immunolocalised the P450arom not only in Leydig...
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