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Catecholamine histofluorescence in the sweat gland innervation of pigmented TH wild-type and TH null mice. Intense catecholamine histofluorescence is present in the sweat gland innervation of P10 pigmented TH wild-type mice. Faint catecholamine histofluorescence can be detected in the sweat gland innervation of pigmented TH null mice at the same age. Scale bar, 20 μm.
