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MS-derived sequences of DDX1, p55.2 and CG1-99. The spectra show derivative ions from doubly charged ions derived from (A) sample 1 (m/z = 636.82), (B) sample 5 (m/z = 610.84) and (C) sample 6 (m/z =906.96) (see Fig. 2). Peptide sequences are generated from Y ions whereby Y1 corresponds to the C-terminal amino acid, in each case a lysine, consistent with their origin from tryptic digestion.
