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CD spectra of duplexes in 10 mM sodium phosphate buffer (pH 7) at 4°C, ∼10 μM strand concentration: (a) DD (filled circle), DD-1 (filled square); (b) DDD (filled circle), DDD-1 (filled square). The spectra marked by triangles are the spectra of the unmodified DD and DDD at 90°C.
