title: Evidence for polarizing zone in the limb buds of Xenopus laevis.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D004627:Embryonic Induction; D005121:Extremities / Q000166:cytology / Q000196:embryology*; D007814:Larva; D008648:Mesoderm / Q000502:physiology; D014981:Xenopus / Q000196:embryology*