In a commentary appearing in this week's Nature, Stanford University's Carlos Bustamante and Francisco De La Vega, and Esteban Burchard from the University of California, San Francisco say that, to date, "medical genomics has focused almost entirely on those of European descent." Because of this, the trio says, "other ethnic groups must be studied to ensure that more people benefit." Wired's Brandon Keim says that while researchers first focused primarily on common genetic varia