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. 2017 May 26;45(13):8014–8025. doi: 10.1093/nar/gkx470

Scheme 3.

Scheme 3.

(A) Schematic illustration of RNA isomers and forms, m indicates methylation sites, and (B) calculated isotopic profiles for 20 nt (A5C5G5U5), 40 nt (A10C10G10U10), and 80 nt (A20C20G20U20) RNA with (open circles) and without (filled circles) a single methylation (+CH2, 14.0157 Da).