Stem cell first for Parkinson's
US researchers have for the first time injected human stem cells into monkeys with Parkinson's symptoms, seen as a key step in the fight to find a cure. The stem cells, which have been injected into rodents in the past, initially stopped the monkeys' damaged brain cells from deteriorating. The primates' condition did however start to slide after four months, the study in the PNAS journal said. Stem cells offer great hope for cures, but a breakthrough remains elusive.