Progesterone is a hormone that is present in males and females, specifically fathers and mothers. It is a hormone that affects the parental instincts. When progesterone inhibitors were introduced to mice, it was found that they act less aggressively towards its young. Whereas the control showed the male mice being aggressive to its young, tearing up the litter and not being around for the young. In mothers or females, it affects the rate of reproduction and maternal behavior. It allows the female to go through changes that supports young. Such as production of milk.
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