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Multi-pass analysis of methyl-cytidine (a) and methyl-adenine (b) isomeric subsets present in the exonuclease mixture from total HeLa RNA (see Experimental). Isomeric sets with 336.06 and 360.07 m/z were isolated in the mass-selective Q, then analyzed after 10 (for methyl-cytidines) or 20 (for methyl-adenosines) passes in the cIM device.
