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Antisense oligos (ASOs) typically do not require HPLC purification due to their short length. Standard desalt purification is suitable for most antisense applications.
For use in live animals, higher purity oligos may be required. In these instances, HPLC purification combined with Na+ salt exchange followed by end-user ethanol precipitation of the antisense oligo is recommended to mitigate toxicity from residual chemicals that may carry over during synthesis.