Beating Cluster of Heart Cells (IMAGE) McGill University Caption The researchers used tiny clusters of chick heart cells that are able to beat on their own to study cardiac arrhythmias. Credit Thomas Quail, Alvin Shrier, and Leon Glass Usage Restrictions Use with 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.