Control heart shows little B2M expression (IMAGE) Hubrecht Institute Caption Shown is a control heart in which green represents cardiomyocytes (heart muscle cells), red shows B2M expression and blue represents cell nuclei. Credit Louk Timmer © Hubrecht Institute Usage Restrictions The image may only be used with appropriate 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.