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Structure of the eccrine sweat gland (panels A-B) and mechanisms of sweat secretion in the secretory coil (panel C) and Na and Cl reabsorption in the proximal duct (panel D). ACh; acetylcholine; AQP-5, aquaporin-5; CFTR, cystic fibrosis membrane channel; ENaC, epithelial Na channel; NaCl, sodium chloride.
