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. Author manuscript; available in PMC: 2015 Jan 22.
Published in final edited form as: J Am Chem Soc. 2013 Oct 23;136(3):826–829. doi: 10.1021/ja408814g

Figure 1.

Figure 1

(A) Previously identified unnatural base pairs. (B) Analogs used in this study, with d5SICSPA shown for comparison.20 R=COCHCl2. Sugar and phosphate backbone are omitted for clarity.