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(a) Lack of KCNQ1 expression in proximal tubules (Immunoperoxidase staining, scale bar 500 µm); (b) KCNQ1 expression in distal convoluted tubular epithelial cells (Immunoperoxidase staining, scale bar 100 µm); (c) Basolateral expression of KCNQ1 channels protein in distal tubular cells (arrows) (Immunoperoxidase staining, scale bar 50 µm); (d) Membrane expression of KCNQ1 on intercalated cells (arrowhead) of medullar collecting ducts (Immunoperoxidase staining, scale bar 50 µm).
