1 Supplementary Table 1: Relative quantification of released c/MAM O-glycan species. Glycan structure H+ Gal(β1-3)[NeuAc(α2-6)]GalNAc-ol 1 677.26 0.4 NeuAc(α2-3)Gal(β1-3)GalNAc-ol 1 677.26 1.0 Gal(β1-3)[Gal(β1-4)GlcNAc(β1-6)]GalNAc-ol 1 751.3 2.6 Gal(β1-3)[HexNAcGlcNAc(β1-6)]GalNAc-ol 1 792.32 1.1 Gal(β1-3)[Gal(β1-4)GlcNAc(β1-6)]GalNAc-ol + Fuc 1 897.36 0.5 NeuAc(α2-3)Gal(β1-3)[NeuAc(α2-6)]GalNAc-ol 1 968.36 37.9 NeuAc(α2-3)Gal(β1-3)[Gal(β1-4)GlcNAc(β1-6)]GalNAc-ol 1 1042.39 1.9 Gal(β1-3)[NeuAc(α2-3)Gal(β1-4)GlcNAc(β1-6)]GalNAc-ol 1 1042.39 11.3 NeuAc(α2-3)Gal(β1-3)[HexNAcGlcNAc(β1-6)]GalNAc-ol 1 1083.42 1.0 NeuAc(α2-3)Gal(β1-3)[NeuAc(α2-3)Gal(β1-4)GlcNAc(β1-6)]GalNAc-ol 2 667.24 39.3 NeuAc(α2-3)Gal(β1-3)[NeuAc(α2-3)Gal(β1-4)GlcNAc(β1-6)]GalNAc-ol + Sulf 2 707.26 3.0 monoisotopic mass relative intensity [%] 2 1