title: Topological approach to embryogenesis.
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000502:physiology; D002319:Cardiovascular System / Q000196:embryology; D002642:Chick Embryo; D004625:Embryo, Nonmammalian / Q000502:physiology*; D005314:Embryonic and Fetal Development; D005260:Female; D006829:Hydra / Q000196:embryology; D008954:Models, Biological; D009024:Morphogenesis; D009432:Neural Crest; D009865:Oocytes / Q000145:classification; D012617:Sea Urchins / Q000196:embryology