Fig. 6.

Schematic showing the different EC-SOD forms. (A) Human EC-SOD (P08294) depicted with cysteine residues indicated (top). The two different forms of EC-SOD are shown in the middle with the determined cysteine connectivity indicated. Underivatized cysteine residues of the native protein are indicated by SH. Human Cu/Zn-SOD (P00441) is aligned at the bottom. (B) The theoretical composition of EC-SOD tetramers and the relative SOD activity of these forms. Two intact disulfide-linked dimers are shown.