Testing Electrical Activity (VIDEO) University of Missouri-Columbia 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 Researchers examined embryonic chickens' hearts and tested the electrical activity present in the cardiac muscle cells over a period of 24 hours. They found that changes in local proteins have important effects on embryonic heart beat control. Credit Courtesy of Dr. Luis Polo-Parada. 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.