title: The relationship between cleavage and blastocoel formation in Xenopus laevis. I. Light microscopic observations.
mesh_terms: D000818:Animals; D001001:Anura; D004475:Ectoderm; D004625:Embryo, Nonmammalian / Q000166:cytology; D005314:Embryonic and Fetal Development; D004707:Endoderm; D005306:Fertilization; D008938:Mitosis; D013997:Time Factors