Figure 2.

(a) To quantify the impact of interference on signal exchange, a third strain is added to the system that produces the enzyme AiiA, a lactonase that cleaves AHL signal. (b) Addition of the interference strain to the sender-and-receiver community reduces the fluorescence intensity per cell of the receiver strain. Here, the negative control shows that the addition of the wild-type yields a curve similar to the case of no interference. Error bars show the standard deviation of three replicate measurements. To see this figure in color, go online.