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Inhibition of scoC-lacZ expression by glnA deletion and recovery by a tnrA null mutation. Open circles, strain TSU2 (wild type); solid circles, TSU2G (glnA); open squares, TSU2T (tnrA); solid squares, TSU2GT (glnA tnrA); diamonds, AY741L (no lacZ promoter). The data set of β-galactosidase activities was from one of two experiments, in which the variations of the enzyme levels were within 15%.
