Scientists are using stem cells from Parkinson’s disease (PD) patients to see if already-discovered drugs might be useful in treating symptoms of the disease. Another approach involves creating functional brain cells in the lab, with the hope that they might replace the cells that are damaged in PD. It’s possible that one day, cells could be transplanted into the brain of Parkinson’s patients to treat the disease. Obviously, scientists want to be certain that this is safe before it is tested in humans, so further research and testing are vital.