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. Author manuscript; available in PMC: 2018 Jun 20.
Published in final edited form as: Biochemistry. 2017 Jun 12;56(24):2985–2994. doi: 10.1021/acs.biochem.6b01192

Figure 2.

Figure 2

(Left) Canonical numbering of guanine nucleobase. (Right) Resonance structures of guanine deprotonated at N1 position with formal charge alternately on the N1 and the O6.