Abstract
The myocardium of nine patients with idiopathic disease of the myocardium (IDM) and 16 control subjects were examined for bound [gamma] -globulin. Five of the IDM subjects were found to have marked accumulation of [gamma] -globulin bound to and extending beneath the sarcolemmal sheath. Two of the control group showed small amounts of [gamma] -globulin in a similar location but without significant histological findings.

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