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Original photographs of myosin heavy chains (MHC) in the myocardium of normal heart (NH) and in patients with aortic stenosis (AS) or with hypertropic obstructive cardiomyopathy (HOCM). Ctr Rabbit skeletal muscle myosin. Human atrial myocardium contained α-MHC and β-MHC. Human ventricular myocardium from patients with NH, AS or HOCM contained only β-MHC
