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N-Glycan symbols of internal standard and significant N-glycans selected by logistic regression analysis. O-Benzyl hydroxylamine hydrochloride (BOA)-labeled amidated sialic acids (A2 amide), which do not exist in nature (peak number 35), were used as the internal standard (a). Putative structures of significant N-glycans selected using Cox regression analysis are presented. Peak number 49 (P49) was selected for overall survival (b).
