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Overall biofuel yield as a function of k p. The controller parameters that give the maximum biofuel yield are: Constant, k p = 0.12; Biofuel-responsive, k p = 4.34, γb = 5.72; Repressor cascade, k p = 7.23, γr = 0.19, k r = 5.01, γb = 0; Feed forward loop, k p = 2.64, γr = 0.016, γbp = 5.89, k r = 0.048, γbr = 0. Other parameters are the same as those listed in Fig. 3
