title: Observations on twin baboon embryos (Papio sp.).
mesh_terms: D000818:Animals; D003338:Corpus Luteum; D004622:Embryo, Mammalian / Q000033:anatomy & histology*; D004717:Endometrium / Q000166:cytology; D005260:Female; D005306:Fertilization; D000882:Haplorhini / Q000196:embryology*; D008297:Male; D010920:Placenta / Q000166:cytology; D011247:Pregnancy; D012728:Sex Chromatin; D014327:Trophoblasts; D014427:Twins