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Comparison of rP4/AMPS (gray with magenta S atom) and D64N/5′-AMP (cyan) (relaxed stereographic view). The black and cyan dashes denote electrostatic interactions in rP4/AMPS and D64N/5′-AMP, respectively. For reference, the 5′-AMP bound to D66N is shown in yellow. The yellow sphere represents Mg2+.
