Mouse Heart Cells on Graphene (VIDEO) University of California - San Diego This video is under embargo. Please login to access this video. Caption Mouse heart cells grown on graphene beat at a rate controlled by light stimulation (as indicated by a green circle at top left corner). Here, the cells are also engineered to produce a red fluorescent protein when stimulated by green light. Credit UC San Diego Health 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.