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. Author manuscript; available in PMC: 2013 Jan 10.
Published in final edited form as: J Chem Theory Comput. 2011 Dec 8;8(1):335–347. doi: 10.1021/ct200712b

Figure 1.

Figure 1

The sugar moieties of DNA (2′-deoxyribose, left) and RNA (ribose, right). The 2′-hydroxyl group of ribose is a powerful donor and acceptor of hydrogen bonds. The illustrated puckering of the sugar rings corresponds to the forms that prevail in B-DNA (C2′-endo, left) and A-RNA (C3′-endo, right) structures. Oxygen is depicted in red, carbon in grey, and nitrogen in blue. The “NB” label denotes the nitrogen atom, either N9 (purine) or N1 (pyrimidine), via which the nucleobase is linked to the anomeric C1′ atom of the sugar. Hydrogens are omitted for the sake of clarity.