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Nucleosides were separated by reverse phase ultra-performance liquid chromatography on a C18 column with online mass spectrometry detection using Agilent 6410 QQQ triple-quadruple LC mass spectrometer in positive electrospray ionization mode.
The nucleosides were quantified using the nucleoside to base ion mass transitions of  
282.1/ 150.1 (m6A), 268.1/136.1 (A), 244.1/112.1 (C), 284.1/152.1 (G), and 245.1/113.1 (U).
Quantification was performed by comparison with the standard curve obtained from pure nucleoside standards running at the same batch of samples. The ratio of m6A to A was calculated based on the calculated concentrations

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