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Nucleotide sequences of the synthetic operators. Underlining indicates the palindrome or the direct repeat to the 3′ half of the palindrome. β-Galactosidase activity was measured for strains XM40 through -45, which contain pAMB22 with the indicated operator sequences cloned in it. Cells were grown in succinate minimal medium. The inducer dRib was added to a final concentration of 1 mg/ml.
