Protects the extracellular space from the toxic effects of reactive oxygen intermediates by converting superoxide radicals into hydrogen peroxide and oxygen. 2 H(+) + 2 superoxide = H2O2 + O2 Expressed at higher levels in females compared to males. RNAi-mediated knockdown results in reduced lifespan and increased sensitivity to paraquat-induced oxidative stress. Belongs to the Cu-Zn superoxide dismutase family. Extended N-terminus. Extended N-terminus. Extended N-terminus.