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Geometry and hydration of rF:G, U:G and G:A base pairs. (A) U:G pair in structure NDB AR0009 (66); (B) rF104:G209; (C) rF204:G109; (D) rF304:G409; (E) rF404:G309; (F) G104:A209# (# designates a symmetry-related residue). Hydrogen bonds in the U:G and G:A base pairs and the corresponding interactions in the rF:G pairs are shown as dashed lines with distances in Å. Water molecules and Mg2+ ions are pink and blue spheres, respectively.
