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If I plan to do a ligation with my oligos, do I need to add a phosphate or is it already present?

Unmodified oligos made from IDT have 5' and 3' Hydroxyl groups, and do not terminal Phosphorylations. If you want a 5' or 3' Phos group on an IDT oligo then you must order the Phosphorylation as a modification.

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