the present study examined the actions of the antiprogestin ru 38486 on progesterone ( p ) -induced facilitation and sequential inhibition of estrous behavior and on brain cytosol progestin receptor ( pr ) levels in ovariectomized , estrogen-primed ( 0.5 micrograms of estradiol benzoate for 3 days ) female rats .
C0033308
progesterone
C0033306
progestin