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Close up of BCDA residues of RU3/4 in the licorice/paperchain/VDW and Quicksurf representations of the primary clusters of: (a) Sf Y, (b) Sf 6n, (c) Sf 6, (d) Sf 6-3Ac, and (e) Sf 6-4Ac O-antigens. The licorice/paperchain/VDW colors: purple- Rha; dark blue—Glc; yellow—Gal; green—COOH; red—O-acetyl; orange—Me; and cyan—electron withdrawing portion of NAc. The Quicksurf colors: blue—hydrophilic surface, pink—hydrophobic & neutral surface.
