the model of delayed implantation produced by injection of progesterone ( p4 ) following hypophysectomy on day 3 of pregnancy , was used to study the temporal relationship between phospholipase a2 ( pla2 ) activity and endogenous concentrations and/or in vitro production of prostaglandins ( pgs ) in the rat uterus during the early phase of implantation .
C0033308
progesterone
C0032961
pregnancy