Frontiers Glutathione the master antioxidant in the regulation of resistant and susceptible host plant virus interaction New Insights into the Roles of Cysteine and Homocysteine in Pathological Processes IntechOpen cbs variants affect homocysteine and glutathione levels PDF) Evaluation of serum levels of oxidized and reduced glutathione and total antioxidant capacity in patients with head and neck squamous cell carcinoma