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. Author manuscript; available in PMC: 2017 Jul 5.
Published in final edited form as: Angew Chem Int Ed Engl. 2013 Nov 7;52(48):12498–12508. doi: 10.1002/anie.201305267

Figure 7.

Figure 7

A) Imidazopyridopyrimidine base pairs and a retrosynthetic approach to these modified nucleotides. B) Imidazopyridopyrimidine: naphthyridine base pairs and an experimental design for testing the single nucleostide insertion by Klenow fragment. Adapted from Refs. [42–44] with permission.