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HilE and FliZ affect hilA expression independently of each other. β-Galactosidase activity in strains containing a hilA–lac transcriptional fusion and the indicated mutations after growth under SPI1 inducing conditions. β-Galactosidase activity units are defined as (μmol of ONP formed min−1) × 106/(OD600 × ml of cell suspension) and are reported as mean ± SD, where n = 4.
