Scaffold (IMAGE) University of Washington Caption The scaffold is built out of a flexible, biocompatible material with 30-micrometer pores that support the fragile cardiac cells and allow access to blood and nutrients. The scaffold for heart repair includes 60-micrometer channels, seen here as the larger holes, where the cardiac cells can fuse into long chains. Credit University of Washington 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.