Local Effect of the Blastocyst on Estrogen and Progesterone Receptors in the Rat Endometrium

Nuclear receptors for both estradiol and progesterone were present in twofold higher concentrations in implantation sites than in nonimplantation regions of the endometrium of 6-day pregnant rats. Decidualization in the absence of an embryo was not accompanied by a similar increase in the concentrat...

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