Testing the clockface model of amphibian limb regeneration.
Contrary to the predictions of the clockface model, rotating a regenerate by 90 degrees produces duplications identical to those resulting from 180 degrees axial reversals. Exchanging regenerates between arms indicates the presence of 2 determined transverse axes.
D000818:Animals; D005552:Forelimb / Q000502:physiology*; D008954:Models, Biological; D012038:Regeneration; D014034:Toes / Q000502:physiology; D014562:Caudata / Q000502:physiology*