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introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (as addition of the placenta in mammalian evolution) caenogenesis , cainogenesis , cenogenesis , kainogenesis , kenogenesis
chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics carbamide , urea
naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency estrone , Estronol , oestrone , theelin
vascular body in a mammalian ovary enclosing a developing egg Graafian follicle
thick membrane around the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the fertilized egg until it is implanted in the wall of the uterus zona pellucida
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