Superoxide dismutase is an enzyme that catalyzes the dismutation of superoxide into oxygen and hydrogen peroxide.

As such, it is an important antioxidant defense in nearly all cells exposed to oxygen.

References

.V. Peskin, C.C. Winterbourn (2000). "A microtiter plate assay for superoxide dismutase using a water-soluble tetrazolium salt (WST-1)". Clinica Chimica Acta 293: 157–166.?