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CID spectrum of ubiquitin radical cation (a) [ubiquitin+8H]9+• and (b) [ubiquitin+3H]4+• at 110mV for 100 ms; (c) Product ion partitioning at different charge states of radical cations; (d) Product ion partitioning of [ubiquitin+4H]5+• at different CID energies. Degree signs indicate water losses whereas lightning bolts indicate species subjected to activation.
