Three isoenzymes of superoxide dismutase were identified in germinating seeds of Pennisetum typhoideum. Isoenzyme-I was localized in chloroplasts and isoenzyme-II was found to be associated with mitochondria. By using inhibitors isoenzyme-I and III were tentatively identified as Cu-Zn superoxide dismutases and isoenzyme-II as a Mn-containing enzyme.
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