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The enzymes from the Gram-negative bacteria Aggregatibacter actinomycetemcomitans and Escherichia coli O52 are involved in activation of fucose for incorporation into capsular polysaccharide O-antigens [1,3]. The enzyme from the Gram-positive bacterium Anoxybacillus tepidamans (Geobacillus tepidamans) is involved in activation of fucose for incorporation into the organism's S-layer . The enzyme from Escherichia coli O52 has a higher catalytic efficiency with NADH than with NADPH .