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~4.5 mg of sulfo-NHS-LC-biotin was added to 1 mL of ~ 90 mg/mL anti-CRP PBS solution (pH 7.2), and the reaction was allowed to proceed  for  ~30  min  at  room  temperature.  Free  biotin  molecules  were  subsequently removed by a Sephadex G-25 PD-10 desalting column.
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