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Holdfast anchor (hfa) and synthesis (hfs) gene cluster conservation is depicted among C. crescentus, H. baltica and H. neptunium. Presence of holdfast genes is correlated to the ability to detect polar holdfast polysaccharide using fluorescent wheat germ agglutinin lectin. The H. neptunium genome contains only hfsAB and fails to make a polar polysaccharide. In contrast, the H. baltica genome contains all essential hfs and hfa genes and produces a holdfast.
