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. Author manuscript; available in PMC: 2018 Apr 1.
Published in final edited form as: J Mass Spectrom. 2017 Apr;52(4):218–229. doi: 10.1002/jms.3919

Figure 1.

Figure 1

ETD mass spectra of [M + Pr + H]4+ for (a) EGF(985–996), (b) hirudin(54–65), and (c) casein kinase II substrate. In the figures, the following colors are used to label the ions: non-metallated z-ions = red, non-metallated c-ions = blue, metal adducted z-ions = bright pink, metal adducted c-ions = green, and metal adducted y-ions = brown. Undissociated precursor ion is labeled in purple with a large purple diamond arrow head. Neutral loss products and electron transfer without dissociation (ETnoD) ions are labeled in black.