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The pseudo-dihedral angle used to describe flipping of flanking bases A272 and A/G273 is defined by center of mass of the basepair C281-G271 (blue), the G271 sugar (red), the sugar of flanking base for which θ is calculated (A272 or A/G273) (orange), and the base itself (A272 or A/G273) (green). (A) Bulged-in and (B) bulged-out geometries of flanking bases.
