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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: J Mass Spectrom. 2012 May;47(5):644–654. doi: 10.1002/jms.2959

Figure 1.

Figure 1

MALDI TOF mass spectra of the peptides resulting from tryptic digestion of (a) di-SUMO-2, (b) di-SUMO-3 and (c) SUMO-1 modified E2 25K. The branch peptide in each case is indicated.