Corrected. Blood from mice treated with iPS cells (above) does not show the sickle-shaped cells present in untreated mice (top).Credit: J. Hanna et al., Science Skin cells reprogrammed to act like embryonic stem cells--a breakthrough first reported in human cells 2 weeks ago--are already showing promise as a therapeutic agent. In today's online edition of Science, researchers describe using induced pluripotent stem (iPS) cells to alleviate symptoms of sickle cell anemia in mice. The technique is not yet safe to try in people, but scientists say it is proof of principle that iPS cells could someday treat human disease. Induced...