CTb (green) and CGRP (red) labeled neurons in the C7 DRG from injury (A,D,G), sham (B,E,H), and normal (C,F,I). (A–C) CTb-labeled neurons are detected in all groups. (D–F) CGRP-labeling identified peptidergic neurons in the C7 DRG. CTb co-localized with neurons that were both positive for CGRP labeling (arrowheads) and that did not express CGRP (arrow) (G–I). Scale bar in (A) is 50μm and applies to all panels. CTb, cholera toxin subunit B; CGRP, calcitonin gene-related peptide; DRG, dorsal root ganglion.