The Nobel Prize in Physiology or Medicine 2007 for their discoveries of principles for introducing specific gene modifications in mice by the use of embryonic stem cells photo: Tim Roberts/PR photo: The p Newswire, HHMI Association Limited Photo: Scanpix/Dan Sears Mario R capecchi Sir Martin J, Evans Oliver smithies ①1/3 of the prize ①1/3 of the prize ①1/3 of the prize USA United Kingdom USA University of Utah Cardiff University University of North Salt Lake City, UT, USA: Cardiff, United Kingdom Carolina at Chapel Hill Howard Hughes Medical Chapel Hill, NC, USA Institute