thus , in contrast to the embryonic chicken heart where at least three mhc isoforms were expressed in both the atria and ventricles , we found in the adult chicken heart that-at a minimum-three mhc isoforms were expressed in the atria , two mhc isoforms were expressed in the ventricular conducting system , and one mhc isoform in the ventricular myocardium .
C0018787
heart
C0018792
atria