# lac operon (3-variable model) f1 = (1+Ge)*(x3*Le+x3+Le) f2 = x1 f3 = (1+Ge)*(x2*Le+x3*(1+x2)) # lac operon (deficient model) f1 = x3 f2 = x1 f3 = x3+x4*x2+x3*x4*x2 f4 = x5+x4*(1+x2)+x5*x4*(1+x2) f5 = x1 # lac operon (9-variable model) f1 = (1+x5)*x4 f2 = x1 f3 = x1 f4 = 1+Ge f5 = (1+x6)*(1+x7) f6 = x8*x3 f7 = (x6*x8+x6+x8)*x9+(x6*x8+x6+x8)+x9 f8 = (1+Ge)*x2*Le f9 = (1+Ge)*(x8*Le+x8+Le)