 But primary Parkinson's disease patients do fairly well and respond well to something called carbidopa-lipidopa. Because what it is, is it's typically a movement disorder that has a lack of dopamine or a neurotransmitter that helps us initiate movements. And that's what you see with President Biden with his slowness of movement, difficulty initiating movements, the stooped posture, difficulty with walking, gait, masked or expressionless face.