in pregnant rabbits , peripheral plasma progesterone concentrations remained high up to day 30 , and there was no increase in uterine venous plasma levels of pgf-2 alpha on day 17 , pgf-2 alpha levels were elevated in uterine venous plasma on day 25 of pregnancy , but there was no concurrent decline in plasma progesterone concentrations .
C0032961
pregnancy
C0033308
progesterone