Destroys radicals which are normally produced within the cells and which are toxic to biological systems (By similarity). Protects spores from cellular damage caused by UV LIGHT. 2 H(+) + 2 superoxide = H2O2 + O2 Binds 1 copper ion per subunit. Binds 1 zinc ion per subunit. Homodimer. Expressed at late-developmental stages. Spore cell specific. Belongs to the Cu-Zn superoxide dismutase family.