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RMSD variation of (a) subtype-B NMR, (b) subtype-B X-ray and (c) subtype-A X-ray structures as a function of salt concentration and magnesium ion binding. (*): Mg(1) and Mg(2) bound at the G274 and G276 phosphate groups. (**): Mg(1) bound at the G274 phosphate group. (***): Mg(1) bound at the G273 phosphate group.
