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The method is E. coli that have PCR252 vector containing the human SOD gene
inoculated in the medium, fermentation, add deionized water into broth, broke by vibration,centrifuge, remove precipitated impurities, ultrafiltration, add cold acetone into crude extracts, fractionation, centrifuge again, remove precipitated impurities, ultrafiltration, freeze drying, finally get SOD freeze-dried medicinal products. Activity is 8000U～15000U/mg.
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