More future application prospects In addition, by replacing the identification object of the upstream system, the measurement of a certain substance can be realized. By adjusting the types of downstream promoters and recombinases, the system threshold can be adjusted.Then the system can not only detect the presence or absence of substances but also dynamically detect the concentration of the detected substances . If we install our system in two kinds of cells so that they can recognize each other and inhibit each other, then we can realize the function of group sensing, which can keep the number of two kinds of cells fluctuating within a certain range. And this will play a important role in industrial production, material detection and other fields. If the cells are made to emit fluorescence, the periodic brightness changes of fluorescence can be seen through periodic fluctuations in the number of cells, thus realizing the function of repressilator.