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WAXS profiles comparing RNA data to “free” MD and the canonical A-form helix from NAB in (a) NaCl only and (b) NaCl/CoHex solution. Insets show representative structures of RNA from MD snapshots. Double-stranded RNA with CoHex appears to have a shorter end-to-end distance and a WAXS profile that has features more similar to the canonical A-form helix.
