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