despite no shifts in the levels of serum progesterone and estradiol-17 beta , the pre-implantation period was , however , associated with distinct changes in enzyme profiles characterized by lower absolute levels ( p less than 0.05 ) of acid phosphatase and beta-glucuronidase on days 3 to 6 of gestation , whereas cathepsin d activity declined significantly ( p less than 0.05 ) on days 5 and 6 .
C0014912
estradiol-17 beta
C0032961
gestation