Schematic Diagram In Vivo Priming (IMAGE) City University of Hong Kong Caption Schematic diagram of the underlying mechanism of in vivo priming. The cardiac patch is 3D-printed with a bioink produced by the mixture of porcine heart-derived extracellular matrix and the MSCs. The patch is then implanted on the infarct area of the rat heart. Credit © City University of Hong Kong / Science Advances Usage Restrictions The image can only be used with appropriate credit and caption. 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.