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. 2020 Apr 22;295(22):7789–7798. doi: 10.1074/jbc.RA120.013444

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© 2020 Kobayashi et al.

Published under exclusive license by The American Society for Biochemistry and Molecular Biology, Inc.

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Figure 5. — Determination of GPI glycan structures of human PrP^C from human brain by LC-ESI-MS/MS analysis. A, left panel, the MS/MS spectra of the m/z 869.75²⁺ ion. All annotated fragment ions are monovalent cations. Right panel, the corresponding structure (MW 1738.3) of a C-terminal peptide with GPI containing Hex and HexNAc-Hex side chains. B, left panel, the MS/MS spectra of the m/z 1015.80²⁺ ion. All annotated fragment ions are monovalent cations. Right panel, the corresponding structure (MW 2029.6) of a C-terminal peptide with GPI containing Hex and HexNAc-Hex-Neu5Ac side chains. C, percentages of GPI glycan species in the human brain. Core only, Core + Hex (fourth Man), and Core + HexNAc (GalNAc) were not detected.