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Electron microscopic images of Cldn2+/+ and Cldn2−/− proximal tubules. (A) Ultrathin section. Arrows indicate tight junctions (TJs). AJ, adherens junction; MV, microvilli. (Bars, 100 nm.) (B) Freeze-fracture replica. Arrowheads indicate TJ strands. MV, microvilli. (Bars, 100 nm.)
