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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Anal Chem. 2009 Oct 1;81(19):8141–8149. doi: 10.1021/ac9013644

Figure 1.

Figure 1

Chromatographic elution plots for doubly charged human insulin B-Chain peptide 23-29. The unmodified form is shown in cyan, while the modified forms (magnified by a factor of 18) are shown in blue (P28+14), green (mixture of F24+16, F25+16, and Y26+16), and red (F25+32).