Heart Muscle Cells (image) Hubrecht Institute Share Print E-Mail Caption Heart muscle cells in the border zone of the zebrafish heart (green), with all cell nuclei in blue. Credit Hessel Honkoop and Fabian Kruse, ©Hubrecht Institute Usage Restrictions The image may only be used with appropriate caption and credit. Share Print E-Mail 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.