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Muscle biopsy from a patient with polymyositis and anti-HMGCR autoantibodies (hematoxylin–eosin stain, original magnification ×20). The biopsy shows scattered necrotic fibers, some of which invaded by mononuclear cells, basophilic regenerating fibers and an inflammatory infiltrate in the perimysium. (Courtesy of Dr. Vattemi G.)
