Regenerating Heart Muscle (IMAGE) Boston Children's Hospital Caption Cross sections of the heart two months after treatment. Mice receiving miR-19a/b have more heart muscle (in green) relative to scar tissue (red). Credit Wang Lab/Boston Children's Hospital and Nature Communications (DOI 10.1038/s41467-019-09530-1) Usage Restrictions please credit as indicated 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.