Composite Muscle Cells (IMAGE) University of California - San Diego Caption Desmoplakin knockout mouse heart muscle section (left); connexin-43 treated mouse heart muscle section (right). Credit UC San Diego Health Sciences Usage Restrictions use photo credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.