synthesis by hamster corpora lutea ( cl ) in vitro and serum levels of progesterone ( p4 ) , 17 alpha-hydroxyprogesterone ( 17ohp ) and 20 alpha-dihydroprogesterone ( 20dhp ) were assessed for different days of pregnancy ( day 1=day of sperm ; day 16=day of delivery ) .
C0045010
17 alpha-hydroxyprogesterone
C0020387
17ohp