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IgG subclass staining in selected cases of ABBA. (a) IgG4 dominant staining along proximal tubular brush borders (fluorescein-conjugated anti-human IgG1/2/3/4 subclass antibodies, original magnification 400x, scale bar = 20 μm). (b) IgG1 and IgG4 co-dominant staining along proximal tubular brush borders (fluorescein-conjugated anti-human IgG1/2/3/4 subclass antibodies, original magnification 400x, scale bar = 20 μm).
