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. 2001 Feb 1;29(3):759–766. doi: 10.1093/nar/29.3.759

Figure 2.

Figure 2

Kinetics of β-galactosidase production by the three expression systems. Salicylate (2 mM) was added to the cultures (OD600 = 0.2), and β-galactosidase activity was monitored at different intervals. Open symbols, cultures without salicylate. Closed symbols, cultures with 2 mM salicylate. nahR/Psal::trp′::′lacZ (squares), xylS2/Pm:trp′::′lacZ (triangles) and nahR/Psal→xylS2/Pm→trp′::′lacZ (circles).