Because Parkinson’s disease results from the loss of one specific type of nerve cells offer a very tangible possibility for treatment. Researchers have recently learned how to differentiate embryonic stem cells into the specific type of brain cell that is lost in Parkinson’s disease. They have also succesfully transplanted adult nerve stem cells into rat brains. When this technique is proven to be effective and save, transplantation of stem cells into the brains of patients may one day allow doctors to reverse the burden of Parkinson’s disease and restore control of movement. Another strategy currently under study is the addition of chemicals or growth factors that aim to induce the patient’s own stem cells to repair the damaged nerves without needing to grow and transplant stem cells.