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Electrospray ionization mass spectra of KYK from aqueous solution showing hydrated ions of the doubly protonated peptide, (KYK + 2H)(H2O)n 2+, and a minor distribution of the singly protonated peptide, (KYK + H)(H2O)n +, with the temperature of the copper block that surrounds the interface capillary at (a) ~95 °C and (b) ~80 °C.
