Zebrafish heart 60 days after injury (IMAGE) Hubrecht Institute Caption Zebrafish heart 60 days after injury showing the structure of the heart muscle cells have completely regenerated. Credit Credit: Phong Nguyen, copyright Hubrecht Institute. Usage Restrictions Image may only be used with the appropriate caption and credit. License Original 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.