Heart Tissue (IMAGE) Max-Planck-Gesellschaft Caption Cellular regression in diseased heart tissue with the help of oncostatin M: The image shows heart muscles under the fluorescence microscope. The myofibrils are stained red, the cell nuclei blue. Credit MPI for Heart and Lung Research 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.