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The roles of Rhesus glycoproteins (Rhbg, Rhcg), in conjunction with those of Na+/K+-ATPase (NKA), Na+/H+ exchanger 2 (NHE2), Na+/H+ exchanger 3 (NHE3), and proton-ATPase (H+-ATPase), in ammonia excretion through the gills of freshwater fishes.
