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(A) A bidentate RNA clamp of magnesium observed in the H. marismortui ribosomal LSU crystal structure (Mg 8003 from PDB entry 1JJ2). (B) The RNA2−–Mg2+•(H2O)4 complex used here for QM calculations. The base has been replaced by a hydrogen atom and the chain is terminated with methyl groups. Ten-membered rings are shaded yellow.
