Heart Failure (IMAGE) University of Iowa Health Care Caption Pictured are heart tissue sections showing a normal mouse heart (left) and one with heart failure (right). The tissue sections were stained to enhance visualization. The failing heart is larger, thinner, and contains a blood clot filling one of its atria (upper right chamber). Photo courtesy of the Grueter laboratory. Credit Photo courtesy of the Grueter laboratory, University of Iowa Health Care Usage Restrictions Please request permission to use image from chad-grueter@uiowa.edu 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.