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LC–MS extracted ion chromatograms of m/z 538 ([M + 2H]2+, z = 2, M = 1074.3963) in the fecal HMO profile of Infant A using nano-HLPC chip/TOF MS. Chromatograms at (A) week 0, (B) week 1, (C) week 2, and (D) week 13. M = monoisotopic (neutral) mass.
