Effects of ventral root, dorsal root, and combined dorsal and ventral root transections on p75-ir in L5 DRGs.1, A micrograph showing normal expression of p75 in the sham-operated DRGs. 2, A micrograph showing ring structures around large neurons from an animal with an L5 ventral root transection one week earlier. An open arrow indicates intact dorsal root, and an arrowhead indicates lesioned ventral root.3, 4, Micrographs of the respective ipsi- and contralateral DRG from an animal with a transection of dorsal root of the L5 spinal ganglion one week earlier. Arrowheads in3 indicate intensely labeled DRG neurons. 5,6, Micrographs of respective ipsi- and contralateral DRG from an animal with combined lesion of dorsal and ventral root of the L5 spinal ganglion 1 week earlier. Scale bar, 200 μm.