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Immunohistochemical positivity of phospholipase A2 receptor in (a and b) idiopathic membranous nephropathy with granular positivity along the glomerular basement membrane (purple arrow) with absence of staining in podocytes (blue arrow). (c) Negative staining in secondary membranous nephropathy with expression only in podocytes (blue arrow). (d) Immunohistochemical expression along the basement membrane as well as podocytes in equivocal cases
