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Fig. 3. Location of various transporters on the gills of tilapia (A, left) coho
salmon (A, right) and rainbow trout (B). CFTR, cystic fibrosis transmembrane
regulator-like anion channel; NKA, Na+/K+ ATPase; AE,
anion exchanger; V-ATPase, a proton pump: NHE, a
Na+/H+-like exchange carrier; NKCC, an
Na+/K+/2Cl cotransporter; PVC,
pavement cell; fwCC, freshwater chloride cell; CC, chloride cell; MR cell,
mitochondria-rich cell; AC, accessory cell. (Modified from
Wilson and Laurent, 2002.)