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. 2017 May 10;14(9):1260–1268. doi: 10.1080/15476286.2017.1325063

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© 2017 The Author(s). Published with license by Taylor & Francis Group, LLC

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.

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Figure 2. — Mass spectra of guanosine (G) and 7-methylguanosine (m⁷G) in different growth media. a unlabeled medium: [M+H]⁺ (G) 284, [M+H]⁺ (m⁷G) 298. b D₃-methionine containing medium: [M+H]⁺ (G) 284, [M+H]⁺ (m⁷G) 301. c ¹⁵N₂ uracil and ¹³C₆ glucose containing medium: [M+H]⁺ (G) 290, [M+H]⁺ (m⁷G) 304. d ¹⁵N₂ uracil, ¹³C₆ glucose and D₃ methionine: [M+H]⁺ (G) 290, [M+H]⁺ (m⁷G) 307. e SILIS: [M+H]⁺ (G) 294, [M+H]⁺ (m⁷G) 311.