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A. Representative H&E stain of a normal human AV node (scale bar=1 mm). B. Immunohistochemical staining of ZO-1 in normal human atrium, AV node, and ventricle (scale bar=100 μm). C. Immunofluorescence staining of ZO-1 and Cx40 in human atrium, AV node, and ventricle (scale bar=10 μm).
