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1 Introduction Cupro-zlnc superoxide dlsmutase(CuZn-SOD)1s a dimeric enzyme,inade of two identical SUbunits,each contai ning a Cu(Ⅱ)ion and a Zn(Ⅱ)ion.His_(44),His_(46),His_(61),His_(118) and one molecule of H_2O are involved in the binding of Cu(Ⅱ),w