Poss Heart Fin (IMAGE) Duke University Caption The green signal in these images of an injured zebrafish heart and a fin indicate the activity of a gene that enhances tissue regeneration. Credit Junsu Kang, Duke University 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.