Figure 1.
Chemical structures of uridine 1, 5-modified uridine derivatives (Xo5U, 2), 5-OMe, 5-SMe and 5-SeMe-uracil-containing oligonucleotides (3a, 3b and 3c) and 2′-SeMe-deoxyuridine (4, 2′-SeMe-dU or SedU).
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