as a result of a large recent increase in knowledge of the potentially damaging effects of certain oxygen metabolites , the role of vitamin e can now be placed in context as one factor in a complex protective system that includes superoxide dismutase , catalase , and peroxidases , including the seleno-enzyme glutathione peroxidase . alpha-tocopherol is presumed to occur in association with intracellular membranes , but the techniques on which this presumption was based have been insufficiently sensitive to allow its confident acceptance .
C0007367
catalase
C0031179
peroxidases