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Fluorine is a poor acceptor in the minor groove of FRNA. (A) Example of the water structure in [f(CGAAUUCG)]2 (PDB code 3P4A).39 (B) Comparison between distances to water molecules by O2′ (red), O2 (pyrimidine)/N3 (purine) (pink) and F2′ (green) in the minor grooves of FRNA or mixed FRNA/RNA duplexes.40
