Heart cells (VIDEO) Howard Hughes Medical Institute This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption In these beating human heart cells, scientists have highlighted a protein important in muscle contraction (green). A new cell atlas reveals this protein and others in different heart cells' locations. Credit Seidman Laboratory Usage Restrictions Must use 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.