title: The control of axial polarity: A. A low molecular weight morphogen affecting the ectodermal ridge B. Ectodermal control of the dorsoventral axis.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D004475:Ectoderm / Q000187:drug effects / Q000502:physiology*; D005121:Extremities / Q000196:embryology*; D066298:In Vitro Techniques; D008970:Molecular Weight; D009024:Morphogenesis / Q000187:drug effects