title: Properties of the primary organization field in the embryo of Xenopus laevis. II. Positional information for axial organization in embryos with two head organizers.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002465:Cell Movement; D002478:Cells, Cultured; D005314:Embryonic and Fetal Development; D007814:Larva; D008636:Mesencephalon / Q000196:embryology; D013696:Temperature; D013997:Time Factors; D014981:Xenopus / Q000196:embryology*