Supernumerary limbs in the axolotl.
D000557:Ambystoma / Q000502:physiology*; D000818:Animals; D004627:Embryonic Induction; D005121:Extremities / Q000033:anatomy & histology / Q000502:physiology*; D008954:Models, Biological; D009024:Morphogenesis; D012038:Regeneration