Heart Tissue Cells (IMAGE) Moscow Institute of Physics and Technology Caption These are heart tissue cells grown on a matrix, stained with fluorescent markers. Credit © Alexander Teplenin et al. / <i>PLOS ONE</i> 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.