“…The isotopic envelope fingerprinting map, annotated MS/MS spectrum with the matched fragment ions, and graphical fragmentation map of each N-glycan identified from the 12 human organs are provided in Supplementary information 2-13 (PDF files, 12 in total, one for each organ). Furthermore, the number of distinct compositions for these Nglycan linkages varied as well, ranging from 17 in the heart to 118 in the spleen, and with different numbers for other organs, including brain (32), lung (39), liver (43), stomach (79), kidney (89), intestine (89), colon (75), testis (60), fat (20), and muscle (20). These variations can be attributed to the presence of sequence isomers, wherein the same composition is linked to different structural arrangements.…”