[ Eq(Derivative(x1, t), (1*k26*(7/2 - x1)*k25 + (-1)*k26*k1*x1*x4/((k2 + x4)*(k3 + x1)) + (-1)*k26*k4*x1*x5**2/((k5*(1 + k6*(x1/x3)**2) + x5**2)*(k7 + x1)) + 1*k26*(k13*x10*x2 - k14*x11*x1) + 1*k26*k15*x2*x11/((k16 + x11)*(k17 + x2)) + (-1)*k26*(k22*x3*x1 - k23*x2**2))/k26),
  Eq(Derivative(x2, t), (1*k26*(11/10 - x2)*k25 + 1*k26*k1*x1*x4/((k2 + x4)*(k3 + x1)) + 1*k26*k4*x1*x5**2/((k5*(1 + k6*(x1/x3)**2) + x5**2)*(k7 + x1)) + (-1)*k26*(k13*x10*x2 - k14*x11*x1) + (-1)*k26*k15*x2*x11/((k16 + x11)*(k17 + x2)) + 2*k26*(k22*x3*x1 - k23*x2**2))/k26),
  Eq(Derivative(x3, t), ((-1)*k26*x3*k25 + (-1)*k26*(k22*x3*x1 - k23*x2**2))/k26),
  Eq(Derivative(x4, t), (1*k26*(50 - x4)*k25 + (-1)*k26*k1*x1*x4/((k2 + x4)*(k3 + x1)))/k26),
  Eq(Derivative(x5, t), ((-1)*k26*x5*k25 + 1*k26*k1*x1*x4/((k2 + x4)*(k3 + x1)) + (-1)*k26*k4*x1*x5**2/((k5*(1 + k6*(x1/x3)**2) + x5**2)*(k7 + x1)) + (-1)*k26*k24*x5)/k26),
  Eq(Derivative(x6, t), ((-1)*k26*x6*k25 + 1*k26*k4*x1*x5**2/((k5*(1 + k6*(x1/x3)**2) + x5**2)*(k7 + x1)) + (-1)*k26*(k8*x6 - k9*x7**2))/k26),
  Eq(Derivative(x7, t), ((-1)*k26*x7*k25 + 2*k26*(k8*x6 - k9*x7**2) + (-1)*k26*k10*x8*x7/((k11 + x7)*(k12 + x8)))/k26),
  Eq(Derivative(x8, t), (1*k26*(4 - x8)*k25 + (-1)*k26*k10*x8*x7/((k11 + x7)*(k12 + x8)) + 1*k26*(k20*x9*x13 - k21*x8*x14))/k26),
  Eq(Derivative(x9, t), (1*k26*(6/25 - x9)*k25 + 1*k26*k10*x8*x7/((k11 + x7)*(k12 + x8)) + (-1)*k26*(k20*x9*x13 - k21*x8*x14))/k26),
  Eq(Derivative(x10, t), ((-1)*k26*x10*k25 + 1*k26*k10*x8*x7/((k11 + x7)*(k12 + x8)) + (-1)*k26*(k13*x10*x2 - k14*x11*x1))/k26),
  Eq(Derivative(x11, t), ((-1)*k26*x11*k25 + 1*k26*(k13*x10*x2 - k14*x11*x1) + (-1)*k26*k15*x2*x11/((k16 + x11)*(k17 + x2)))/k26),
  Eq(Derivative(x12, t), ((-1)*k26*x12*k25 + 1*k26*k15*x2*x11/((k16 + x11)*(k17 + x2)) + (-1)*k26*k18*x12/(k19 + x12))/k26),
  Eq(Derivative(x13, t), ((-1)*k26*x13*k25 + 1*k26*k18*x12/(k19 + x12) + (-1)*k26*(k20*x9*x13 - k21*x8*x14))/k26),
  Eq(Derivative(x14, t), ((-1)*k26*x14*k25 + 1*k26*(k20*x9*x13 - k21*x8*x14))/k26),
  Eq(Derivative(x15, t), ((-1)*k26*x15*k25 + 1*k26*k24*x5)/k26) ]