Cardiac Muscle (image) University of California - San Diego Caption Microscopic images of pig hearts damaged by heart attack show the growth of new heart muscle tissue (Shown in Red, Figure A) after treatment with an injectable hydrogel compared to a heart left untreated (Figure B, right). The gel forms a scaffold in damaged areas of the heart, encouraging new cell growth and repair. Credit Photo credit: Karen Christman, UC San Diego Jacobs School of Engineering. Usage Restrictions Credit required 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.