title: Chromosome studies in early embryogenesis.
mesh_terms: D000028:Abortion, Induced; D000328:Adult; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D002901:Chromosomes, Human, 13-15; D002902:Chromosomes, Human, 16-18; D002906:Chromosomes, Human, 6-12 and X; D004622:Embryo, Mammalian / Q000166:cytology*; D005260:Female; D005865:Gestational Age; D006801:Humans; D008297:Male; D011247:Pregnancy; D012729:Sex Chromosome Aberrations; D012737:Sex Factors; D014314:Trisomy