http://www.sciencedaily.com/releases/2007/09/070911090159.htm
<p>Sept. 14, 2007 (Science Daily)- UCSF scientists are reporting what they say is a significant improvement in the technique for genetically reprogramming mouse cells to their embryonic state, a process that transforms the cells, in essence, into embryonic stem cells. The finding builds on the strategic breakthrough reported by Shinya Yamanaka, MD, PhD, in 2006, and confirmed in the spring of 2007 both by Yamanaka’s team and, in independent studies, by scientists at MIT, Harvard and UCLA…</p>