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A three-stage process, consisting of an ammonium sulfate precipitation step, dialysis desalination with microporous anion-exchange Neosepta membranes and anion-exchange chromatography on DEAE-cellulose DE-52 was used for the isolation of mouse monoclonal antibodies specific against different antigens. The ascites fluids contained monoclonal antibodies against human IgG, against horseradish peroxidase...