Zebrafish Heart (IMAGE) Salk Institute Caption An injured zebrafish heart shows proliferating cells in the wounded area of the heart (red) and cardiac muscle cells (green). Credit Salk Institute Usage Restrictions with credit 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.