this work suggests that the subunits of the tm from skeletal and cardiac muscles are heterogenous in their m.w . and their charges and that in the heart as well as in skeletal muscle a relationship seems to exist between the amount of the beta component and the speed of contraction of the muscle : a higher amount of this component was found in the bulky hearts which are also those which contract slower .
C0027061
cardiac muscles
C0018787
hearts