{ diff(x1, t) = (1*k29*k1*(1 - x1) + (-1)*k29*k2*x8*x1 + 1*k29*k3*x7 + (-1)*k29*k4*x1*(x3 + x4))/k29,
  diff(x2, t) = (1*k29*k2*x8*x1 + (-1)*k29*k5*x2 + (-1)*k29*(k6*(1 + k7*x3 + k8*x4)*x5 + k9*(1 + k10*x3 + k11*x4)*x6)*x2 + (-1)*k29*k12*x2*x4)/k29,
  diff(x3, t) = (1*k29*k13*x2 + (-1)*k29*k14*x3)/k29,
  diff(x4, t) = (1*k29*k15*x6 + 1*k29*k16*x5 + (-1)*k29*k17*x4)/k29,
  diff(x5, t) = (1*k29*x5*(1 - x5) + 1*k29*(k18*x3 + k19*x4)*x5)/k29,
  diff(x6, t) = (1*k29*k20*x6*(1 - x6) + 1*k29*k21*x2*x6)/k29,
  diff(x7, t) = ((-1)*k29*k3*x7 + 1*k29*k4*x1*(x3 + x4) + 1*k29*k12*x2*x4)/k29,
  diff(x8, t) = (1*k29*x2*k22/(1 + k23*x3 + k24*x4) + (-1)*k29*k25*x8 + (-1)*k29*k26*x8*x9)/k29,
  diff(x9, t) = ((-1)*k29*k26*x8*x9 + 1*k29*k27*(1 - x9) + 1*k29*k28*x8)/k29 }