The Promise of Chimeric Organisms (IMAGE) Salk Institute Caption Salk scientists advance stem-cell and genome-editing technologies to help researchers study evolution and disease, test therapeutic drugs and possibly grow transplantable organs. Here, human iPS cells (green) contributed to a developing heart of 4-week-old pig embryo. Credit Salk Institute Usage Restrictions With credit and related coverage 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.