Cell loss of the aged rat blastocysts in relation to their viability.
D000818:Animals; D001755:Blastocyst / Q000166:cytology / Q000502:physiology; D002369:Castration; D010065:Embryo Implantation, Delayed; D005260:Female; D007016:Hypophysectomy; D051381:Rats; D014327:Trophoblasts / Q000166:cytology