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Using Matlab we simulated the behavior of the system when o.a. concentration varies. Then, we plotted the steady state values of PHO80PHO85 (red light) and PHO8 (green light). The following pictures show the results of this analysis when K1 varies. 

                           Resp1.jpg
                           Resp2.jpg
                           Resp3.jpg

It's clear that k1=0.1 and K1=0.5 doesn't ensure a correct behavior of the system: the repression of PHO8 is too weak when the oleic acid concentration becomes greater than 7.1 mM! We repeated the same analysis for the varying parameters K2 and K3 and we found that a good behavior is given by k2=1 and k3=0.1. This is confirmed be the following pictures: 

                           Resp4.jpg
                           Resp5.jpg
                           Resp6.jpg
                           Resp7.jpg
                           Resp8.jpg
                           Resp9.jpg
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