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β-Galactosidase activities, expressed from lasR-lacZ (pPCS1001) (A), rhlR-lacZ (pPCS1002) (B), lasI-lacZ (pPCS223) (C), and rhlI-lacZ (pLPRI) (D) fusions, were determined during growth in PTSB medium. Experiments were repeated on three different occasions in triplicate. Error bars represent the standard deviations of three determinations.
