a single injection of 2 or 4 mg progesterone , 4 mg 5 alpha-dihydroprogesterone , or 4 mg 3 alpha-hydroxy-5 alpha-pregnan-20-one 72 h ( day 3 ) after estrogen pretreatment induced a highly significant increase in serum lh and fsh 6 h later ( 1800 h ) .
C0033308
progesterone
C0012311
dihydroprogesterone