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. Author manuscript; available in PMC: 2007 Apr 2.
Published in final edited form as: J Am Chem Soc. 2005 Dec 21;127(50):17626–17627. doi: 10.1021/ja056977r

Figure 2.

Figure 2

MS isotope profiles for the tryptic peptide containing a single dimethyllysine (Res. #6-14 CELAAAMKR) at various reaction stoichiometries. The reaction conditions in moles of 13C formaldehyde relative to the moles of reactive amines are listed along with the normalized percentages of 13C incorporation calculated from the profiles.