Master of Regeneration (IMAGE) Helmholtz Association Caption Flatworms are masters of regeneration and an ideal model organism for researchers to investigate stem cells and their regulation. Credit Photo/Copyright: A. Sánchez Alvarado/Copyright: HHMI 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.