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SAV4209 is a Streptomyces avermitilis protein with a hot dog fold that is similar to those of (R)-specific enoyl-CoA hydratase, the peroxisomal Hydratase-Dehydrogenase-Epimerase (HDE) protein, and the fatty acid synthase beta subunit. The alpha- and gamma-proteobacterial members of this CD have, in addition to a hot dog fold, an N-terminal extension.