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. Author manuscript; available in PMC: 2012 Oct 18.
Published in final edited form as: Methods Mol Biol. 2012;832:65–80. doi: 10.1007/978-1-61779-474-2_3

Figure 3.

Figure 3

Measurement of the abundance of Ub linkages by mass spectrometry. (A) The synthesis of stable isotope-labeled internal standard as exemplified by K48 linkages. (B) and (C) Representative AQUA analysis of K11 and K48 linkages, respectively.