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Protein gene product 9.5 staining of axons (black) in a 50-μm-thick section of skin depicting the rich sensory and autonomic innervation of hairy skin (a). Autonomic fibers innervate an arrector pili muscle and a sweat gland (arrows). Sensory fibers are seen at the base of the hair follicle and also branching from the subepidermal neural plexus, crossing the dermal–epidermal basement membrane (arrowheads) to innervate the epidermis (b)
