Engineered human heart muscle tissue (IMAGE) Hubrecht Institute Caption Microscopy image of engineered human heart muscle tissue with a PKP2 mutation, used as a model of ACM. The heart muscle cells are visible in pink and fibrosis (scarring) in green. Credit Credit: Eirini Kyriakopoulou. Copyright: Hubrecht Institute. Usage Restrictions Image may only be used with the appropriate caption and credit. License Original 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.