title: Positional information and the spatial pattern of cellular differentiation.
mesh_terms: D000663:Amphibians / Q000254:growth & development; D000818:Animals; D002454:Cell Differentiation; D003063:Cnidaria / Q000254:growth & development; D004447:Echinodermata / Q000196:embryology / Q000254:growth & development; D005121:Extremities / Q000254:growth & development; D005360:Fibula / Q000254:growth & development; D007313:Insecta / Q000254:growth & development; D008938:Mitosis; D008962:Models, Theoretical; D009030:Mosaicism