[ Eq(Derivative(x1, t), ((-1)*k39*k1*x1/(k2 + x1) + 1*k39*k3*x2/(k4 + x2))/k39),
  Eq(Derivative(x2, t), (1*k39*k1*x1/(k2 + x1) + (-1)*k39*k3*x2/(k4 + x2))/k39),
  Eq(Derivative(x3, t), ((-1)*k39*k5*x3*x2/(k6 + x3) + 1*k39*k7*x4/(k8 + x4) + (-1)*k39*k33*x3*x9/(k34 + x3) + 1*k39*k35*x5/(k36 + x5))/k39),
  Eq(Derivative(x4, t), (1*k39*k5*x3*x2/(k6 + x3) + (-1)*k39*k7*x4/(k8 + x4))/k39),
  Eq(Derivative(x5, t), (1*k39*k33*x3*x9/(k34 + x3) + (-1)*k39*k35*x5/(k36 + x5))/k39),
  Eq(Derivative(x6, t), ((-1)*k39*(k9*x4*x6/(k10 + x6) + k11*x11*x6/(k12 + x6)) + 1*k39*k13*x7/(k14 + x7))/k39),
  Eq(Derivative(x7, t), (1*k39*(k9*x4*x6/(k10 + x6) + k11*x11*x6/(k12 + x6)) + (-1)*k39*k13*x7/(k14 + x7))/k39),
  Eq(Derivative(x8, t), ((-1)*k39*k15*x8*x7/(k16 + x8) + 1*k39*k17*x9/(k18 + x9) + (-1)*k39*(k29*x8*x15 - k30*x13))/k39),
  Eq(Derivative(x9, t), (1*k39*k15*x8*x7/(k16 + x8) + (-1)*k39*k17*x9/(k18 + x9))/k39),
  Eq(Derivative(x10, t), ((-1)*k39*k19*x10*x2/(k20 + x10) + 1*k39*k21*x11/(k22 + x11) + (-1)*k39*(k31*x10*x15 - k32*x14))/k39),
  Eq(Derivative(x11, t), (1*k39*k19*x10*x2/(k20 + x10) + (-1)*k39*k21*x11/(k22 + x11))/k39),
  Eq(Derivative(x12, t), 0/k39),
  Eq(Derivative(x13, t), 1*k39*(k29*x8*x15 - k30*x13)/k39),
  Eq(Derivative(x14, t), 1*k39*(k31*x10*x15 - k32*x14)/k39),
  Eq(Derivative(x15, t), ((-1)*k39*(k23*x9*x15/(k24 + x16) + k25*x11*x15/(k26 + x15)) + 1*k39*k27*x16/(k28 + x16) + (-1)*k39*(k29*x8*x15 - k30*x13) + (-1)*k39*(k31*x10*x15 - k32*x14) + 1*k39*k37)/k39),
  Eq(Derivative(x16, t), (1*k39*(k23*x9*x15/(k24 + x16) + k25*x11*x15/(k26 + x15)) + (-1)*k39*k27*x16/(k28 + x16) + (-1)*k39*k38*x16)/k39) ]