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Anti-Müllerian hormone (AMH) was detected in perinatal and postnatal sheep ovaries, using avidin-biotin immunohistochemistry with a monoclonal antibody specific for ruminant AMH. Immunoreactivity was limited to granulosa cells, and was influenced both by the degree of follicular development, and by the age of the animal. In the fetus, only the most advanced follicles exhibited a faint immunoreactivity at 120 days gestation, and no reaction was observed in younger animals. Immediately before and after birth, primordial follicles were still negative, but a faint reaction was elicited in young growing follicles, increasing with follicle size. Strong immunoreactivity was visible in antral follicles, especially in the innermost granulosa cell layers, close to the oocyte and lining the antral cavity.
Bézard et al. (Wed,) studied this question.
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