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Analysis of transferrin peptides in case 1. a identification of doubly- and triply charged species, not present in controls. b MS/MS analysis of m/z 1252.1 indicates a p.N630T mutation in the second transferrin glycosylation site, thus peptide 622-QQQHLFGSN VTDCSGNFCLFR-642 is mutated to 622-QQQHLFGST VTDCSGNFCLFR-642
