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Domains similar to fish antifreeze type III protein SAF domains are found in a wide variety of proteins with quite different functions. They are components of enzymes, such as D-altronate-dehydratases or sialic acid synthetases, of antifreeze proteins conserved in fish (where they bind to nascent ice crystals), and may act as periplasmic chaperones in bacterial flagella basal body P-ring formation.
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