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(A) Amyloid with glomerulus infiltrated by homogeneous acellular material replacing normal structures (Congo red stain ×400). (B) Apple green birefringence under polarized light, magnification ×200. (C) Immunostaining for amyloid A protein is positive in the distribution of the amyloid deposits, indicating AA amyloidosis (Amyloid A, clone mc1; hematoxylin, ×400).
