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SOD is located intracellular (SOD-1; cytosolic, SOD-2; mitochondrial matrix) and extracellular (SOD-3), and catalyzes the dismutation of superoxide anion to H2O2. SOD3, or EC-SOD, is the most recently characterized SOD, exists as a copper and zinc-containing tetramer, and is synthesized containing a signal peptide that directs this enzyme exclusively to extracellular spaces. SOD-3 is a Mn-containing tetrameric protein with a subunit Mr of 24-35 kDa. The activity of EC-SOD is dependent on its ability to form a tetramer of 135 kDa.