Destroys radicals which are normally produced within the cells and which are toxic to biological systems. 2 H(+) + 2 superoxide = H2O2 + O2 Binds 1 copper ion per subunit. Binds 1 zinc ion per subunit. Homodimer, and heterodimer of Superoxide dismutase [Cu-Zn] A and B. Expressed both maternally and zygotically. Expression accumulates through oogenesis, remaining more or less constant at the beginning of embryogenesis, to slightly increase later on (at protein level). Belongs to the Cu-Zn superoxide dismutase family.