CTR1 expression in rat DRG tissue. (A) Neuronal CTR1 immunoreactivity in DRG tissue associated with the plasma membranes (broken arrow) and granular vesicular structures (solid arrow) of the cell bodies of large neurons, with lighter diffuse cytoplasmic staining of other neuronal cell bodies, without staining of nuclei (n) or nerve fibres (f). (B) Enlarged frame in A. Inset in A was a negative control. (C) Fluorescent immunohistochemistry shows no overlap between smaller-sized ATP7A-immunoreactive neurons (red) and larger-sized CTR1-immunoreactive neurons (green) or DAPI-stained satellite cells (asterisk). Scale bar, 20 μm.