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a. ERMS spectrum of [β-Gal-(1 → 3)-α-GlcNAc-OH+Na]+ at the MS4 stage. b. ERMS spectrum of unfragmented precursor of [β-Gal-(1 → 3)-α-GlcNAc-OH+Na]+ at the MS5 stage. c. ERMS spectrum of [β-Gal-(1 → 3)-β-GlcNAc-OH+Na]+ at the MS4 stage. d. ERMS spectrum of unfragmented precursor of [β-Gal-(1 → 3)-β-GlcNAc-OH+Na]+ at the MS5 stage.
