luteal and interstitial cell rna contents and circulating progesterone ( p ) and 20 alpha-hydroxypregn-4-ene-3-one ( 20 alpha-oh p ) levels were measured during pseudopregnancy in order to characterize relationships between ovarian 20 alpha-oh p secretion and luteal regression .
C0033308
progesterone
C0012311
20 alpha-hydroxypregn-4-ene-3-one