Fetal-Heart Cell Enzyme (IMAGE) University of Pennsylvania School of Medicine Caption Cross-section of expression of HDAC2 (red) in mouse fetal heart. Credit Jonathan A. Epstein, MD, University of Pennsylvania School of Medicine, Nature Medicine 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.