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Transcriptional activity of luxS and ainS in culture. β-Galactosidase activity of V. fischeri wild-type cells carrying either a luxS::lacZ fusion (solid diamonds) or an ainS::lacZ fusion (open diamonds) in trans on low-copy-number plasmids pCL152 and pCL154, respectively, was measured during growth. Shown are the cumulative data of three cultures; standard deviation bars were smaller than the symbols.
