DβH immunoreactivity in the spinal cord.A, Lumbar dorsal horn of a saline-injected withdrawing rat; B, lumbar dorsal horn of a toxin-injected withdrawing rat; C, lumbar ventral horn of a saline-injected withdrawing rat; and D, lumbar ventral horn of a toxin-injected withdrawing rat. Note the complete loss of DβH immunoreactivity in the dorsal horn of the toxin-treated rat (B) and the partial loss of DβH immunoreactivity in the ventral horn of the toxin-treated rat (D) (arrows). Scale bar, 100 μm.