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Organization of the xyl locus in various bacteria. The xylR gene encodes a regulatory protein, xylA encodes a xylose isomerase, xylB encodes a xylulose kinase; xylF encodes a xylose-binding protein, xylT encodes a xylose transporter, xylG encodes an ATP-binding protein, and xylH encodes a membrane transporter (ABC-type xylose transport). ?, Sequenced open reading frame of unknown function. References are given in parentheses.
