Rescue of Cardiac Defects in Id Knockout Embryos by Injection of Embryonic Stem Cells Diego Fraidenraich, Elizabeth Stillwell, Elizabeth Romero, David Wilkes, Katia Manova, Craig T. Basson, and Robert Benezra Science 8 October 2004: 247-252. http://www.sciencemag.org/cgi/content/abstract/306/5694/247