UCHL1 and keloid: In contrast, PGP9.5-positive nerve fibres were focally attached to the basal cell layer in the normal skin (Fig. 3A, N2 and Supplementary Fig. S2), whereas numerous nerve fibres extended into the epidermis, with some reaching the granular layer in the peripheral regions of the anterior chest keloids (Fig. 3A, KA5 lower panel, Supplementary Fig. S2 and movie S1).