Healthy/Unhealthy (IMAGE) University of Pennsylvania School of Medicine Caption Compared to a healthy heart on the left, microscopic views of a heart from a CAP2 mutant mouse on the right identifies an area of heart disease. The electrocardiogram underneath shows that the mutant hearts skip beats during sudden cardiac death. Credit Jeffrey Field, PhD, Perelman School of Medicine, University of Pennsylvania Usage Restrictions None License Licensed 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.