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A single O unit is shown as it is built on the lipid carrier, Und-PP. The transferase responsible for the addition of each sugar of the O unit is shown. The repeat unit is given in square brackets. The Wzy polymerisation linkage is also shown to the left of the repeat unit. Sugar abbreviations: Abe, abequose; Gal, galactose; Man, mannose; Par, paratose; Rha, rhamnose; Tyv, Tyvelose.
