A. Representative micrographs showing vehicle- and IL-33-treated sciatic nerves. B-D. IL-33 significantly improved the axon regeneration/nerve repair as suggested by behavioral (B), electrophysiological (C), and morphometric studies (D, sciatic nerve; E, tibial nerve). *p < 0.05. Error bars, s.e.m; N=10 per group; Scale bar: 10 μm.