{ diff(x1, t) = 0/k28,
  diff(x2, t) = (1*k17*(k27*k23/(k11 + k23) - x2)*(x1 - x2) + (-1)*(k4*k15*x3/(k16 + x3)*(x6/(k10 + x6))^3*x2 - k5*(x3/(k11 + x3))^2 + k6*x2*x2))/k30,
  diff(x3, t) = (1*((-k7)*x3*(k18 - x4) + k8*x4) + 1*(k4*k15*x3/(k16 + x3)*(x6/(k10 + x6))^3*x2 - k5*(x3/(k11 + x3))^2 + k6*x2*x2) + (-1)*k21*x3^4/(k14^4 + x3^4) + (-1)*k20*x3/(k13 + x3) + 1*k22 + (-1)*k19*x3^2/(k12^2 + x3^2))/k29,
  diff(x4, t) = (-1)*((-k7)*x3*(k18 - x4) + k8*x4)/k29,
  diff(x5, t) = (-1)*k17*(k27*k23/(k11 + k23) - x2)*(x1 - x2)/k28,
  diff(x6, t) = (1*k2*(k1 - k26*k1*(exp((-x12)/k24) + exp((-x12)/k25) + (exp((-x12)/k24) - exp((-x12)/k25))*(k24 + k25)/(k24 - k25)))*x3/(k9 + x3) + (-1)*k3*x6)/k29,
  diff(x7, t) = (-1)*k2*(k1 - k26*k1*(exp((-x12)/k24) + exp((-x12)/k25) + (exp((-x12)/k24) - exp((-x12)/k25))*(k24 + k25)/(k24 - k25)))*x3/(k9 + x3)/k29,
  diff(x8, t) = 1*k3*x6/k29,
  diff(x9, t) = (1*k21*x3^4/(k14^4 + x3^4) + 1*k19*x3^2/(k12^2 + x3^2))/k29,
  diff(x10, t) = 1*k20*x3/(k13 + x3)/k29,
  diff(x11, t) = (-1)*k22/k29,
  diff(x12, t) = 1*k31/k28,
  diff(x13, t) = (-1)*k31/k28,
  diff(x14, t) = 0/k28 }