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(A) The structure of the major repeating unit in CA. l-Fucose units are highlighted in blue. (B) The wca operon in Escherichia sp. The positive regulators of CA biosynthesis, RcsA/B, are highlighted in black; gmd and fcl are highlighted in blue and pink, respectively. (C) Optimization of CA production and incorporation of non-natural sugars. AN = accession number.
