Stem Cell-Derived Cardiomyocytes (IMAGE) Sanford Burnham Prebys Caption These are cardiomyocytes (heart muscle cells) generated from stem cells and expressing a green fluorescent protein. Credit Sanford-Burnham Medical Research Institute Usage Restrictions Free to use in association with this story only, using provided caption and 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.