The initiation of limb bud outgrowth in the embryonic chick.
D000818:Animals; D001345:Autoradiography; D002455:Cell Division; D002642:Chick Embryo / Q000254:growth & development*; D005121:Extremities / Q000196:embryology*; D006614:Hindlimb / Q000196:embryology; D008648:Mesoderm; D013936:Thymidine / Q000378:metabolism; D013997:Time Factors; D014316:Tritium; D014921:Wings, Animal / Q000196:embryology
D014316:Tritium; D013936:Thymidine