Super-silenced DNA (IMAGE) University of Pennsylvania School of Medicine Caption Enhanced reprogramming of skin cells (blue) to liver-like cells (red and green) by reducing expression of a repressive protein. Credit The laboratory of Ken Zaret, PhD, Perelman School of Medicine, University of Pennsylvania 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.