serial injections of a mixture of pge2 and pgf2 alpha 6 , 8 , 10 and 12 h after concurrent administration of progesterone with hcg and indomethacin completely restored the indomethacin-blocked ovulation , suggesting that progesterone can substitute the action of prostaglandins injected serially in the first half of the preovulatory process .
C0012472
pge2
C0033554
prostaglandins