based on sds polyacrylamide gel electrophoresis ( sds-page ) , the major proteins present in uterine fluid at days 60-140 of gestation were the uterine milk proteins ( utm-proteins ) , a pair of structurally-related , progesterone-induced polypeptides with molecular weights of 55,000 and 57,000 .
C0032961
gestation
C0033308
progesterone