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Immunohistochemical localization of Na+/K+_ATPase (NKA) and Na+/K+/2Cl− cotransporter (NKCC) in the mucosal surface of the small intestine of P. sinensis. NKA and NKCC immunoreactivity showed positive expression in the mucosal surface (black arrow). Lu: lumen. Scale bar = (A–D) 50 µm.
