title: Extracellular matrix maintains apical ectodermal ridge in culture.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D004372:Ducks; D004475:Ectoderm / Q000166:cytology / Q000502:physiology*; D004848:Epithelium / Q000502:physiology; D005109:Extracellular Matrix / Q000502:physiology*; D013997:Time Factors; D014022:Tissue Survival; D014921:Wings, Animal / Q000196:embryology