Representative indirect fluorescent digital photomicrographs of cryostat axial sections of normal adult sural nerves show UEA-1-positive endothelium (green; A,E, I) with proteins AQP1, FLNA and CD63 (red; B, F, J respectively) demonstrating expression by micro- and macrovascular endothelial cells, the perineurium and pericytes on merged images at lower and higher magnifications (yellow/orange for endothelial cells). AQP1-negative endoneurial microvessels with retained pericyte expression (white arrowheads; D) are seen in a single normal adult sural nerve (Sural Nerve 2, see Table 2). CD63 is also expressed by Schwann cells (I-L). White arrows demonstrate positively staining endoneurial microvessels. Blue (DAPI) staining indicates nuclei. Scale bar 500 μm for A-C, E-G and I-K, and 125 μm for D, H and L.