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Partial ETD mass spectra of fully deuterated 10+ ubiquitin showing the c17 (left) and c16 (right) fragment ions obtained at 3, 41, and 92 minutes during exchange for hydrogen. The monoisotopic peak (m) and each isotope peak in the distribution are labeled. Partial ETD spectra for the fully protonated c17 and c16 fragment ions obtained without HDX are inset.
