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A superoxide dismutase (SOD) with the molecular weight of 31,079 has been purified as a homodimer from Panax ginseng by employing neutral pH buffer extraction, ammonium sulfate precipitation, isoelectric point precipitation and ion exchange methods. The enzyme's specific activity determined by an improved Marklund method was 9480.43 U/mg. Metal analysis showed that the SOD contained iron with the...