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Expression of the lsr operon in E. coli mutants in the presence and absence of luxS. The β-galactosidase activity of the lsr-lacZ (b1513-lacZ) fusion was determined in strains KX1123 (WT), KX1218 (luxS), KX1186 (lsrK), KX1372 (lsrK luxS), KX1304 (glpD), and KX1306 (glpD luxS) after 5 h of growth.
