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. Author manuscript; available in PMC: 2013 Apr 6.
Published in final edited form as: J Chromatogr A. 2012 Jan 9;1232:266–275. doi: 10.1016/j.chroma.2011.12.100

Fig. 4.

Fig. 4

[M+2H]2+ molecular-ion region of the full scan ESI mass spectrum for #EGYY*GYTGAFR differentially labeled with N-dimethylation in various (1:10, 1:3, 1:1, 3:1 and 10:1) molar ratios (* represents nitrotyrosine, and # denotes either light or heavy N-dimethyl label).