therefore , in the present investigation , induction of implantation by an injection of p4 and e2 following 5 days of ovariectomy performed on day 4 of pregnancy clearly suggests that once exposed to p4 for 24 hr , the mouse uterus retains a long-term effect , i.e. , following p4 withdrawal for several days , 24 hr of initial p4 priming is no longer required for p4 and estrogen to initiate implantation .
C0032961
pregnancy
C0014939
estrogen