Heart Cells (IMAGE) University of Wisconsin-Madison Caption Induced cardiac progenitor cells (iCPCs) injected into hearts of mice with experimentally induced heart attacks generate new heart muscle. Newly developed heart muscle cells are shown by overlapping red (heart muscle protein) and green (iCPC protein) labeling, and cell nuclei are shown in blue. Credit Pratik Lalit 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.