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The mammary bud is actually exteriorized, becomes separated from the epidermis, and is eliminated. As a result, no nipple or mammary structures are present in the newborn male mouse. Thus, the Grey Pantyhose Free Porn pattern (masculinization) of mammary development is indicated at birth of the mouse fetus as the absence of nipples and the female pattern Sexy XXX Tube - Beth Chapman Naked Pictures videos. indicated by the presence of nipples.

Androgen receptors appear in the developing mouse mammary gland at the early bud stage and the production of androgen by the developing male testis has a role in the masculinization Sexy XXX Tube - Beth Chapman Naked Pictures videos. the developing mammary gland. The developmental pattern of mammary glands in the mouse fetus has been used to study the role of steroid hormones in mammary development during the fetal stage.

The following examples are from studies using mice where the steroid hormone exposure of the developing fetus is experimentally manipulated. Remember that pregnancy in mice is 21 days. Testosterone injection into the pregnant mouse on days 8, 9, or 10 of pregnancy leads to masculinization of the mammary gland of female fetuses. The female fetuses are born without nipples. The mammary anlage (here the mammary bud) becomes exteriorized and is separated from the epidermis, as observed by day 14 or 15.

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