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. Author manuscript; available in PMC: 2016 Oct 24.
Published in final edited form as: J Am Soc Mass Spectrom. 2014 May 28;25(7):1124–1135. doi: 10.1007/s13361-014-0916-x

Figure 1.

Figure 1

Nano-HPLC-nanoESI+-HRMS3 extracted ion chromatograms and MS3 spectra of synthetic EB guanine II (0.1 fmol) (A) and [15N5]-EB guanine II (5 fmol) (B).