title: Retinoic acid causes the development of feathers in the scale-forming integument of the chick embryo.
abstract: Injection of retinoic acid (3×62.5 μg or 3×125 μg) into the amniotic sac of chick embryos between 10 and 12 days of incubation resulted in the formation of club-shaped feathers within the feather tracts, and the development of feathers in the scale-forming areas of the feet. The latter finding is interpreted as caused by a disturbance of the tissue interactions which occur in the skin of the feet at this time.
authors.affiliation: Laboratoire de Zoologie et Biologie Animale, Equipe de recherche associée au CNRS no 621 "Morphogenèse expérimentale", Université Scientifique et Médicale de Grenoble, F-38041, Grenoble Cedex, France.
authors.forename: Danielle
authors.initials: D
authors.lastname: Dhouailly
authors.affiliation: Laboratoire de Zoologie et Biologie Animale, Equipe de recherche associée au CNRS no 621 "Morphogenèse expérimentale", Université Scientifique et Médicale de Grenoble, F-38041, Grenoble Cedex, France.
authors.forename: Margaret Hurlstone
authors.initials: MH
authors.lastname: Hardy
keywords: Chick embryo; Integument morphogenesis; Ptilopody; Vitamin A (retinoic acid)