[ Eq(Derivative(x1, t), (1*k14*k1*x1*(1 - x1/k2) + (-1)*k14*k3*x1*x2)/k14),
  Eq(Derivative(x2, t), (1*k14*k3*x1*x2 + (-1)*k14*k4*x2 + (-1)*k14*k5*x2)/k14),
  Eq(Derivative(x3, t), (1*k13*k6 + (-1)*k7*x2*x3 + (-1)*k13*k8*x3)/k13),
  Eq(Derivative(x4, t), (1*k7*x2*x3 + (-1)*k13*k8*x4 + (-1)*k13*k10*x4 + (-1)*k13*k9*x4)/k13),
  Eq(Derivative(x5, t), (1*k13*k9*x4 + (-1)*k13*k8*x5)/k13) ]