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(A) LC–MS chromatograms of SCX S2, RP R13, and the synthetic peptide WLQL, (B) MS spectra of WLQL originated from fraction SCX S2 (m/z 559.07, tR 13.51 min), fraction RP R13 (m/z 559.24, tR 13.47) and synthetic WLQL (m/z 559.08, tR 13.54).
