[ Eq(Derivative(x1, t), (1*k71*k5*(1 - k21 - k22)*x1 + (-1)*k71*k14*x1 + (-1)*k71*k5*k20*(1 - k21/2 - k22)*x1 + (-1)*k71*k22*k5*x1 + (-1)*k71*k41*x1*x11/(x11 + k48) + (-1)*k71*k70*x1*x9/(k66 + x9))/k71),
  Eq(Derivative(x2, t), (1*k71*k5*k21*x1 + 1*k71*k22*k5*x1 + 1*k71*k1*(1 - k19)*log(1/2*k25/(x2 + k23)) + (-1)*k71*k10*x2 + (-1)*k71*k19*k1*x2 + (-1)*k71*k43*x2*x11/(x11 + k51) + 1*k71*k65*x2*x12/(x12 + k50) + (-1)*k71*k70*x2*x9/(k68 + x9))/k71),
  Eq(Derivative(x3, t), (1*k71*k5*k20*(1 - k21/2 - k22)*x1 + 1*k71*k5*(1 - k21 - k22)*x3 + (-1)*k71*k14*x3 + (-1)*k71*k22*k5*x3 + (-1)*k71*k42*x3*x11/(x11 + k49) + (-1)*k71*k70*x3*x9/(k67 + x9))/k71),
  Eq(Derivative(x4, t), (1*k71*k21*k5*x3 + 1*k71*k22*k5*x3 + 1*k71*k19*k1*x2 + 1*k71*k1*x4*log(1/2*k25/(x4 + k24)) + (-1)*k71*k11*x4 + (-1)*k71*k43*x4*x11/(x11 + k53) + 1*k71*k65*x4*x12/(x12 + k52) + (-1)*k71*k70*x4*x9/(k69 + x9))/k71),
  Eq(Derivative(x5, t), (1*k71*k3*x5*(x2 + x4)/(x5 + k26) + (-1)*k71*k12*x5 + 1*k71*k44*x5*x11/(x11 + k54))/k71),
  Eq(Derivative(x6, t), (1*k71*k4*x6*(x2 + x4)/(x6 + k27) + (-1)*k71*k13*x6 + 1*k71*k64*x6*x12/(x12 + k56))/k71),
  Eq(Derivative(x7, t), (1*k71*k6*x7*x5/(k28 + x7) + (-1)*k71*k16*x7 + 1*k71*k37*x13*x7/(x13 + k38) + (-1)*k71*k63*x12*x7/(x12 + k55))/k71),
  Eq(Derivative(x8, t), (1*k71*k7*x8*x6/(k29 + x8) + (-1)*k71*k17*x8)/k71),
  Eq(Derivative(x9, t), (1*k71*k8*x9*(x2 + x4)/(x9 + k30) + 1*k71*k8*x9*x7/(x9 + k33) + (-1)*k71*k35*x9*(x1 + x3)/(x9 + k31) + (-1)*k71*k15*x9 + (-1)*k71*k36*x9*x10/(k32 + x10))/k71),
  Eq(Derivative(x10, t), (1*k71*k9*x10*x6/(x10 + k34) + (-1)*k71*k18*x10 + 1*k71*k62*x12*x10/(x10 + k57))/k71),
  Eq(Derivative(x11, t), (1*k71*k45*x7 + 1*k71*k46*x9 + (-1)*k71*k47*x11)/k71),
  Eq(Derivative(x12, t), (1*k71*k58*x6 + 1*k71*k59*x10 + 1*k71*k60*x8 + (-1)*k71*k61*x12)/k71),
  Eq(Derivative(x13, t), (1*k71*k39*x7 + (-1)*k71*k40*x13)/k71) ]