Traumatic brain injuries do more kinds of damage than thought, a pair of University of California Los Angeles researchers have found. That includes changes in leukocytes—a finding that could help diagnosis and treatment of related disorders. [The researchers] have identified master genes they believe control hundreds of other genes linked to a variety of neurological conditions, behavioral conditions, and illnesses. These include Alzheimer’s disease, Parkinson’s disease, post-traumatic stress disorder, stroke, attention deficit hyperactivity disorder (ADHD), autism, schizophrenia, and other disorders.