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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 4.

Figure 4

Model systems used to treat platform energetics: (left) full dinucleotide platform (here 5′-GpU-3′); (center) rSPSOM; (right) base-to-base (here GU). Phosphorus is depicted in orange, oxygen in red, nitrogen in blue, and carbon in grey. Hydrogens are omitted for the sake of clarity. The 5′ → 3′ progression of the RNA chain is from left to right.