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Reverse phase HPLC purification of trityl-on ODNs containing both G and PPG. g represents PPG in the indicated sequences. Chromatography was performed on a 7 × 300 mm Hamilton PRP-1 column in 0.1 M triethylammonium acetate with a gradient of 0–60% acetonitrile over 20 min, flow rate = 2 ml/min.
