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Partial mass spectra of UbcH5b peptide [117–130] conjugated by a K63 ubiquitin dimer truncated by acid cleavage. Top: partial MALDI spectrum recording near-average masses. Bottom: partial decharged nanospray spectrum showing monoisotopic masses. Peptide sequences in red originate from UbcH5b. Peptide sequences in black originate from ubiquitin.
