In a breakthrough, scientists may have discovered a cure for a form of baldness after they found a drug which restored the hair of three patients within five months. Researchers at Columbia University Medical Centre  identified the immune cells responsible for destroying hair follicles in people with alopecia areata, a common autoimmune disease that causes hair loss. They report initial results from an ongoing clinical trial of an FDA-approved drug, which has produced complete hair regrowth in several patients with moderate-to-severe alopecia areata.