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.
