[ Eq(Derivative(x1, t), (1*k28*k1*x1*(1 - x1/k2) + (-1)*k28*x1*(k16*0 + 1/5*k16/(k18*k17**2)*x2**2) + (-1)*k28*(k11*x4 + k3)*x1)/k28),
  Eq(Derivative(x2, t), (1*k28*0*k17 + (-1)*k28*k18*x2)/k28),
  Eq(Derivative(x3, t), (1*k28*k4*(k26*x6/(x1 + x6) + k11*x4 + k3)**2/((k26*x6/(x1 + x6) + k11*x4 + k3)**2 + k14**2)*(x1 + x6)/((k26*x6/(x1 + x6) + k11*x4 + k3)**2/((k26*x6/(x1 + x6) + k11*x4 + k3)**2 + k14**2)*(x1 + x6) + k5) + 1*k28*(1 - x5/(1 + k27/k22))*(1 - (k26*x6/(x1 + x6) + k11*x4 + k3)**2/((k26*x6/(x1 + x6) + k11*x4 + k3)**2 + k14**2)*(x1 + x6)/((k26*x6/(x1 + x6) + k11*x4 + k3)**2/((k26*x6/(x1 + x6) + k11*x4 + k3)**2 + k14**2)*(x1 + x6) + k15))*x3*(k7 - k8) + (-1)*k28*k9*x3)/k28),
  Eq(Derivative(x4, t), (1*k28*(1 - x5/(1 + k27/k22))*(1 - (k26*x6/(x1 + x6) + k11*x4 + k3)**2/((k26*x6/(x1 + x6) + k11*x4 + k3)**2 + k14**2)*(x1 + x6)/((k26*x6/(x1 + x6) + k11*x4 + k3)**2/((k26*x6/(x1 + x6) + k11*x4 + k3)**2 + k14**2)*(x1 + x6) + k15))*x3*k8 + (-1)*k28*k10*x4)/k28),
  Eq(Derivative(x5, t), (1*k28*k13*x4/(k12 + x4) + (-1)*k28*k13*x5)/k28),
  Eq(Derivative(x6, t), (1*k28*x1*(k16*0 + 1/5*k16/(k18*k17**2)*x2**2) + (-1)*k28*k26*x6)/k28) ]