Figure 6.

Representative trisaccharide unit {→4)-[α-L-Fucp-(1→3)]-β-d-GlcA-(1→3)-β-d-GalNAc-(1→} of the FucCS backbone from sea cucumber in its 3D stick models. The sites of possible substitution by sulfate groups are C2, C3 and C4 of Fucp unit and C4 and C6 of GalNAc as indicated in the structure. Hydrogens, carbons, oxygens and nitrogens are represented in light grey, dark grey, red and blue, respectively. Carbon atoms are numbered according to their positions in the ring. Monosaccharides are indicated accordingly. Model created by the online AMBER/GLYCAM-based carbohydrate builder [40].