app 201-533 [ 3-amino-6-methyl-5-phenyl-2 ( 1h ) -pyridinone ] was investigated in vivo in anesthetized and unanesthetized dogs and pithed open-chest cats and in vitro in guinea pig atria and papillary muscles , skinned muscle fibers from pig hearts , and rat myocardium .
C0225828
muscle fibers
C0027061
myocardium