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LC-MS chromatogram of (A) LPSW (m/z 502) pre-incubated with DPP-IV for 3 h at 37 °C. (B) MS spectra of SW fragment (m/z 292.12), and (C) LP fragment (m/z 229.25). SW and LP were fragments derived from LPSW after 3 h pre-incubation with DPP-IV.
