{ diff(x1, t) = (1*k72*k60*k2 + (-1)*k60*k72*k3*x1/(k1 + x1) + (-1)*k60*k72*k57*x1*k50^k58/(k50^k58 + x5^k58))/k72,
  diff(x2, t) = (1*k60*k72*k57*x1*k50^k58/(k50^k58 + x5^k58) + (-1)*k60*k72*k5*x2/(k4 + x2) + (-1)*k60*k72*(k6*x2 - k7*x3))/k72,
  diff(x3, t) = (1*k60*k72*(k6*x2 - k7*x3) + (-1)*k60*k72*k9*x3/(k8 + x3))/k72,
  diff(x4, t) = (1*k60*k72*k13*k11/(k11 + x9)*x3^k59/(k15^k59 + x3^k59) + (-1)*k60*k72*k14*x4/(k10 + x4))/k72,
  diff(x5, t) = (1*k60*k72*k18*x4 + (-1)*k60*k72*k17*x5/(k16 + x5))/k72,
  diff(x6, t) = (1*k61*k72*k65*k51/(k51 + x23)*x10/(k36 + x10)*x24/x25 + (-1)*k61*k72*k66*x6/(k37 + x6) + (-1)*k61*k72*k21*x6)/k72,
  diff(x7, t) = (-1)*k61*k72*(k39*x7 - k38*x10)/k72,
  diff(x8, t) = (1*k61*k72*(k34*x24 - k35*x8*x9) + 1*k61*k72*k31*x11 + (-1)*k61*k72*k32*x8/(k33 + x8))/k72,
  diff(x9, t) = 1*k61*k72*(k34*x24 - k35*x8*x9)/k72,
  diff(x10, t) = (1*k61*k72*k20 + (-1)*k61*k72*k19*x10 + (-1)*k61*k72*k65*k51/(k51 + x23)*x10/(k36 + x10)*x24/x25 + 1*k61*k72*k66*x6/(k37 + x6) + 1*k61*k72*(k39*x7 - k38*x10))/k72,
  diff(x11, t) = (1*k61*k72*k22 + 1*k61*k72*k23*x7^k28/(k25^k28 + x7^k28) + 1*k61*k72*k30*x14^k29/(k26^k29 + x14^k29) + (-1)*k61*k72*k24*x11/(k27 + x11))/k72,
  diff(x12, t) = (1*k62*k72*k67*x26^k56/(k44^k56 + x26^k56)*x17/(k45 + x17) + (-1)*k62*k72*k68*x12/(k46 + x12))/k72,
  diff(x13, t) = (1*k62*k72*k69*x12/x20*x18/(k48 + x18) + (-1)*k62*k72*k43*x16*x13/(k47 + x13))/k72,
  diff(x14, t) = (1*k62*k72*k70*x13/x21*x19/(k49 + x19) + (-1)*k62*k72*k71*x14/(k52 + x14))/k72,
  diff(x15, t) = (1*k62*k72*k63*x14^k55/(k53^k55 + x14^k55) + (-1)*k62*k72*k64*x15/(k54 + x15))/k72,
  diff(x16, t) = (1*k62*k72*k40*x15 + (-1)*k62*k72*k41*x16/(k42 + x16))/k72,
  diff(x20, t) = 0/k72,
  diff(x21, t) = 0/k72,
  diff(x22, t) = 0/k72,
  diff(x23, t) = 0/k72,
  diff(x25, t) = 0/k72,
  diff(x26, t) = 0/k72 }