The relationship of the zone polarizing activity to supernumerary limb formation (twinning) in the chick wing bud.
D000818:Animals; D002642:Chick Embryo; D004475:Ectoderm; D008846:Micromanipulation; D009693:Nucleic Acid Hybridization; D014921:Wings, Animal / Q000002:abnormalities / Q000196:embryology*