the effect of exogenous progesterone ( p ) on the corpus luteum function ( in terms of the secretion of p and 20-alpha-dihydroprogesterone ( dhp ) , on the secretion of prolactin ( prl ) and on the pituitary responsiveness to lhrh was studied in pseudopregnant ( psp ) rats kept in alternating and constant lighting conditions ( ld-psp and ll-psp rats , respectively ) .
C0033308
progesterone
C0012311
20-alpha-dihydroprogesterone