Does shedding of the zona pellucida by the rat blastocyst depend on  stimulation by the ovarian hormones?
D000818:Animals; D002369:Castration; D004967:Estrogens / Q000502:physiology*; D005260:Female; D010053:Ovary / Q000601:surgery; D010063:Ovum; D011247:Pregnancy; D011270:Pregnancy, Animal; D011555:Pseudopregnancy; D051381:Rats
D004967:Estrogens