title: Observations on the chromosome number in the first and the second cleavage division of mouse embryos derived from fertilization in vitro.
mesh_terms: D000818:Animals; D002869:Chromosome Aberrations; D002875:Chromosomes; D002970:Cleavage Stage, Ovum; D004622:Embryo, Mammalian / Q000648:ultrastructure*; D005260:Female; D005307:Fertilization in Vitro; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D011247:Pregnancy; D015053:Zygote / Q000648:ultrastructure