Flaw in induced-stem-cell model

Nature News: "Medical researchers' hopes of replacing politically fraught embryonic stem (ES) cells with stem cells derived from adult tissues have suffered a setback. ...patterns of epigenetic changes — alterations that affect gene expression without changing the DNA sequence — tell a different story about iPS cells, a team led by Joseph Ecker, a molecular geneticist at the Salk Institute in La Jolla, California, reports online in Nature this week."