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The above painting depicts electron microscopy of two glomerular capillary loops and a mesangial region from a case of membranous lupus nephritis, showing intramembranous and mesangial electron-dense deposits. An electron photomicrograph from a patient with membranous lupus nephritis, showing the same features, is also shown below. Pure membranous lupus nephritis (classified under the International Society of Nephrology / Renal Pathology Society system as class V), without an associated focal or diffuse (proliferative) lupus nephritis, occurs in approximately 15 percent of all patients with renal involvement by systemic lupus erythematosus (SLE). This percentage is higher in African Americans with SLE. While...