The modifications of enzymatics activities which involved dehydrogenases (LDH, MDH and G6PDH) alkalines phosphatases (Ph. Alc., ATP/as at Ph 7,2 and Ph 9,4) and hydrolases (Ph Ac. and beta Glu) were studied during the experimental deciduomata evolution in the Rat from the 5th to the 9th day. One the 5th day the uterus were used as control. Dehydrogenases and alkalines phosphatases activites appeared in isolated cells of sub-epithelial and middle antimesometrial stroma on the 5th day. Then, on the 6th day, they distributed themselves in strings of 8 to 10 cells. On the 7th day, they were regulary arranged in the decidual area. The growing decidual tissue was always surrounded by an hydrolysis activity.
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