{ diff(x1, t) = ((-1)*x1*k2*k56 + (-1)*k3*x1 + 1*x2*k7 + 1*x5*k8)/k69,
  diff(x2, t) = (1*k3*x1 + 1*x3*k4 + (-1)*x2*k5 + (-1)*x2*k7)/k69,
  diff(x3, t) = (1*x1*k2*k56 + (-1)*x3*k4)/k69,
  diff(x4, t) = (1*x2*k5 + (-1)*x4*k6*x11)/k69,
  diff(x5, t) = (1*x4*k6*x11 + (-1)*x5*k8)/k69,
  diff(x6, t) = ((-1)*x6*k9*x4 + 1*x7*k12 + (-1)*x6*k11 + 1*x9*k15)/k69,
  diff(x7, t) = (1*x6*k9*x4 + (-1)*x7*k12 + (-1)*x7*k10*x17*k1 + 1*x8*k13)/k69,
  diff(x8, t) = (1*x7*k10*x17*k1 + (-1)*x8*k13 + (-1)*x8*k14)/k69,
  diff(x9, t) = (1*x8*k14 + 1*x6*k11 + (-1)*x9*k15)/k69,
  diff(x10, t) = ((-1)*x10*k16*x7 + 1*x11*k17)/k69,
  diff(x11, t) = (1*x10*k16*x7 + (-1)*x11*k17)/k69,
  diff(x12, t) = ((-1)*k18*x12*x7 + 1*k19*x13 + 1*k23*x14)/k69,
  diff(x13, t) = (1*k18*x12*x7 + (-1)*k19*x13 + (-1)*k20*x13*x19)/k69,
  diff(x14, t) = ((-1)*k21*x14*x8 + 1*k22*x15 + (-1)*k23*x14)/k69,
  diff(x15, t) = (1*k20*x13*x19 + 1*k21*x14*x8 + (-1)*k22*x15)/k69,
  diff(x16, t) = ((-1)*x16*(k24*x15 + k25*x13) + 1*x17*k26)/k69,
  diff(x17, t) = (1*x16*(k24*x15 + k25*x13) + (-1)*x17*k26)/k69,
  diff(x18, t) = ((-1)*x18*k29*x4 + 1*k27*x19)/k69,
  diff(x19, t) = (1*x18*k29*x4 + (-1)*k27*x19)/k69,
  diff(x20, t) = ((-1)*x20*(k30*x15 + k31*x14^k33/(k32^k33 + x14^k33)) + 1*x21*k34)/k69,
  diff(x21, t) = (1*x20*(k30*x15 + k31*x14^k33/(k32^k33 + x14^k33)) + (-1)*x21*k34)/k69,
  diff(x22, t) = (1*x23*k35*x21 + (-1)*x22*k36)/k69,
  diff(x23, t) = ((-1)*x23*k35*x21 + 1*x22*k36)/k69,
  diff(x24, t) = ((-1)*x24*k39*x17^k44/(k43^k44 + x17^k44) + 1*x25*k40)/k69,
  diff(x25, t) = (1*x24*k39*x17^k44/(k43^k44 + x17^k44) + (-1)*x25*k40)/k69,
  diff(x26, t) = ((-1)*x26*k41*x25 + 1*x27*k42)/k69,
  diff(x27, t) = (1*x26*k41*x25 + (-1)*x27*k42)/k69 }