title: On the formation of somites.
authors.affiliation: Department of Anatomy, School of Medicine, University of Pennsylvania, Philadelphia 19104.
authors.forename: J W
authors.initials: JW
authors.lastname: Lash
authors.forename: D
authors.initials: D
authors.lastname: Ostrovsky
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D004622:Embryo, Mammalian / Q000502:physiology*; D004625:Embryo, Nonmammalian; D009024:Morphogenesis; D009672:Notochord / Q000502:physiology*