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CD spectra of duplexes in 10 mM sodium phosphate buffer (pH 7.0) at 4 °C, ∼10 μM strand concentration: (a) DDD (●) and DDD-1 (O) and (b) DD (●) and DD-1 (O). The spectra without symbols are the spectra of the unmodified DDD and DD at 90 °C.
