the concentrations of progesterone ( delta 4p ) , 20 alpha-dihydroprogesterone ( 20 alpha-dhp ) , testosterone ( t ) , oestrone ( e1 ) and oestradiol-17 beta ( e2 beta ) in peripheral blood serum ( pbs ) , amniotic fluid ( af ) and placental tissue of rabbits during gestation were determined by radioimmunoassay .
C0033308
progesterone
C0012311
20 alpha-dihydroprogesterone