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A Pathology-Congo red strain in myocardium (HE 400×). Ambiguity Congo red strain in myocardium on microscopy (HE 400×). B. Immunofluorescence in myocardium (lambda 200×). Positive lambda light chain in myocardium on immunofluorescence (lambda 200×). C. Immunohistochemistry in myocardium (lambda 200×). Positive lambda light chain in myocardium on immunohistochemistry (lambda 200×).
