Embryonic and adult stem cells offer similar protection against neurodegenerative disease, according to a landmark study in mice which has achieved a number of firsts with human stem cells. For the first time, rodents genetically predisposed to disease lived longer and healthier lives after receiving injections of the human cells, researchers claim. “We have been talking about stem cells for a decade and no one had cured anything with stem cells before this,” comments Eva Mezey, a researcher at the National Institutes of Health in Bethesda, Maryland, US, who was not involved in the work. In the new study, Evan...