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. 2015 Apr 22;43(10):5171–5181. doi: 10.1093/nar/gkv288

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© The Author(s) 2015. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 1. — Mass spectra of RNA 1 (2 μM) in 9:1 H₂O/CH₃OH with 20 mM CH₃COONH₄ as additive electrosprayed in (A) negative and (B) positive ion mode; (C) and (D) show measured (lines) and calculated (circles) isotopic profiles for (M-5H)⁵⁻ and (M+5H)⁵⁺ ions, respectively.