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Transcriptional regulation of lsrR expression. E. coli ZK126 (wild type) and strains containing deletion of crp, luxS, lsrK, lsrR, and lsrACDBFG carry plasmid pJLlsrR (lsrR-lacZ). All strains were grown in LB medium except for ZK126 (WT*), which was grown in LB plus 0.8% glucose. At different time points during cell growth, aliquots were collected for measurement of the OD600 (circles, triangles, and squares) and β-galactosidase activity (bars).
