Shedding of the zona pellucida by the rat blastocyst.
D000818:Animals; D010064:Embryo Implantation / Q000502:physiology*; D005260:Female; D010063:Ovum / Q000502:physiology*; D011247:Pregnancy; D051381:Rats; D014327:Trophoblasts / Q000502:physiology*; D014599:Uterus / Q000502:physiology