maternal progesterone concentrations changed from 8 to 2 ng/ml , androstenedione from 200 to 400 pg/ml , estrone from 65 to 250 pg/ml , and 15-keto-13,14-dihydroprostaglandin f2 alpha from 200 pg/ml to 6000 pg/ml over the last 4 or 5 days of gestation .
C0014942
estrone
C0032961
gestation