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Q-TOF mass spectrometry analysis of S. aureus rRNA 2052-2064. In the triply deprotonated ion of the molecule, the fragment GGACGGAAAGACC runs at 1433.54 m/z (when unmethylated). Monomethylation and dimethylation at A2058 result in mass shifts to 1438.21 m/z and 1442.89 m/z, respectively. The unmethylated fragment with a Na ion is observed at 1440.87 m/z.

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