title: The nature of developmental restrictions in Xenopus laevis embryos.
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000166:cytology; D002450:Cell Communication; D002478:Cells, Cultured; D005775:Gastrula / Q000166:cytology; D014982:Xenopus laevis / Q000196:embryology*