Stem Cell Derived Heart Cells (IMAGE) International Society for Stem Cell Research Caption SPEDOX-6 causes less damage to heart cells than dox. Left: stem cell derived heart cells treated with dox. Right: stem cell derived heart cells treated with SPEDOX-6. Red shows the fluorescent signal from DOX treatment entering the cell. Green shows the heart cell muscle fibers. Credit Arun Sharma, PhD, Cedars-Sinai Medical Center Usage Restrictions Credit must be given to the creator. License CC BY 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.