The infarction group (presenting coagulative necrosis and contraction band necrosis) showing a marked loss of desmin and myoglobin, as well as a highly increasing of fibrinogen and C5b-9 in necrotic fibers, similar findings were observed in subjects with coronary thrombosis and without infarction even if the extension and the intensity of the immunoreactions were weaker. The gene discussed is MB; the disease is coronary thrombosis.