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Chemical structure of the pentoses l-arabinose, d-xylose, and d-arabinose (Top) and their effect on SPI-1 expression (Bottom). β-Galactosidase activity of a hilA::lac fusion in LB and LB + 0.2% and 1% of the appropriate pentose. Experiments with l-arabinose and d-xylose were performed in AraAˉ and XylAˉ backgrounds, respectively.
