Fig. 2

MS analysis of the neutral free-N-glycan. The MS (A) and MS² (B) spectra of the neutral free-PA-glycan at m/z 1281 [M + H]⁺ are shown. Asterisk indicates the fragment products of fucose migration. Symbol representations of glycans are as follows: circle, Hex; square, HexNAc; triangle, dHex.