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Figure 4: Photomicrograph of kidney biopsy shows (a) membranoproliferative pattern with cellular crescent and plasma cell-rich tubulointerstitial nephritis, (b) IgG4-positive plasma cells in interstitium and IgG4 positivity in immune complexes along glomerular capillaries, (c and d) show IgG and c3 positivity in glomerular capillaries and mesangium (a: H and E, ×20, b: IHC for IgG4 ×40, c: FITC IgG (×20), d: FITC C3 (×20). (IgG4 RD: IgG4-related disease, IgG4 RKD: IgG4-related kidney disease)

Figure 4: Photomicrograph of kidney biopsy shows (a) membranoproliferative pattern with cellular crescent and plasma cell-rich tubulointerstitial nephritis, (b) IgG4-positive plasma cells in interstitium and IgG4 positivity in immune complexes along glomerular capillaries, (c and d) show IgG and c3 positivity in glomerular capillaries and mesangium (a: H and E, ×20, b: IHC for IgG4 ×40, c: FITC IgG (×20), d: FITC C3 (×20). (IgG4 RD: IgG4-related disease, IgG4 RKD: IgG4-related kidney disease)