Scientists have shown that mice suffering from a depletion of the antioxidant glutathione in dopamine-producing neurons developed nerve damage and symptoms associated with Parkinson’s disease (PD) in humans. Dopamine is a neurotransmitter produced in the mid-brain which facilitates many critical functions, including motor skills. Past studies have shown that depletion of the naturally occurring antioxidant in the affected area of the brain is one of the earliest signs of PD, but this study shows that glutathione depletion may be a causal factor in the disorder.