Immunolocalization of B1R. Shown are confocal microscopy pictures of coronal sections of subdiaphragmatic vagus nerve isolated from control rats (A-F) and STZ rats (A’-F’). B1R (A-A’, D-D’) was labeled with anti-B1R (green spots, arrows). Peptidergic C-fibers (B-B’, E-E’) were labeled with anti-CGRP (red) and overlay pictures (yellow) showing co-localization were shown in C-C’ and F-F’. Images are representative of at least four sections from four rats per group. Scale bar = 100 (A-C, A’-C’) or 31.8 μm (D-F, D’-F’).