{ diff(x1, t) = ((-1)*k14*k3*(1 - k2)*k4*x1*x2/(x3 + x2 + x5 + x6 + x1 + x4) + 1*k14*k6*x4 + (-1)*k14*k5*x1 + (-1)*k14*k2*(1 - k3)*k4*x1*x2/(x3 + x2 + x5 + x6 + x1 + x4) + (-1)*k14*k2*k4*k3*x1*x2/(x3 + x2 + x5 + x6 + x1 + x4))/k14,
  diff(x2, t) = ((-1)*k14*k10*x2 + 1*k14*k7*x3 + (-1)*k14*k5*x2 + (-1)*k14*k9*x2)/k14,
  diff(x3, t) = (1*k14*k2*(1 - k3)*k4*x1*x2/(x3 + x2 + x5 + x6 + x1 + x4) + (-1)*k14*k7*x3 + (-1)*k14*k8*x3 + (-1)*k14*k5*x3)/k14,
  diff(x4, t) = (1*k14*k3*(1 - k2)*k4*x1*x2/(x3 + x2 + x5 + x6 + x1 + x4) + (-1)*k14*k6*x4 + (-1)*k14*k5*x4)/k14,
  diff(x5, t) = (1*k14*k2*k4*k3*x1*x2/(x3 + x2 + x5 + x6 + x1 + x4) + 1*k14*k9*x2 + (-1)*k14*k11*x5 + (-1)*k14*k5*x5)/k14,
  diff(x6, t) = (1*k14*k10*x2 + 1*k14*k8*x3 + 1*k14*k11*x5 + (-1)*k14*k5*x6)/k14 }