{ diff(x1, t) = ((-1)*k50*k40*x1*x7 + 1*k50*x8*k20*k40 + (-1)*k50*k29*x1 + 1*k50*x3*k18*k29 + 1*k50*k3*k29*k35^2/(k29*k35 + k35^2 + k18*k29*k35))/k50,
  diff(x2, t) = ((-1)*k50*x5*x2*k41 + 1*k50*x7*k21*k41 + (-1)*k50*k30*x2 + 1*k50*x4*k19*k30 + 1*k50*k4*k30*k36^2/(k30*k36 + k36^2 + k19*k30*k36))/k50,
  diff(x3, t) = (1*k50*k36*x9 + 1*k50*k44*x9 + (-1)*k50*k35*x3 + 1*k50*x10*k17*k44 + 1*k50*x10*k16*k36 + 1*k50*k29*x1 + (-1)*k50*x3*k18*k29 + 1*k50*k28*x9)/k50,
  diff(x4, t) = (1*k50*k35*x9 + 1*k50*k44*x9 + (-1)*k50*k36*x4 + 1*k50*x10*k17*k44 + 1*k50*k30*x2 + (-1)*k50*x4*k19*k30 + 1*k50*k28*x9)/k50,
  diff(x5, t) = ((-1)*k50*x5*x2*k41/k32 + 1*k50*x7*k21*k41/k32 + (-1)*k50*k47*x5)/k50,
  diff(x6, t) = (1*k50*k36*x9 + 1*k50*k35*x9 + 1*k50*x10*k16*k36 + 1*k50*k28*x9 + (-1)*k50*k44*x6)/k50,
  diff(x7, t) = (1*k50*x5*x2*k41 + (-1)*k50*x7*k21*k41 + (-1)*k50*k40*x1*x7 + 1*k50*x8*k20*k40)/k50,
  diff(x8, t) = (1*k50*k40*x1*x7 + (-1)*k50*x8*k20*k40 + (-1)*k50*k42*x8*x18 + 1*k50*x10*k24*k42 + (-1)*k50*x8*k15*k29)/k50,
  diff(x9, t) = ((-1)*k50*k36*x9 + (-1)*k50*k35*x9 + (-1)*k50*k44*x9 + 1*k50*x8*k15*k29 + (-1)*k50*k28*x9)/k50,
  diff(x10, t) = (1*k50*k42*x8*x18 + (-1)*k50*x10*k24*k42 + (-1)*k50*x10*k17*k44 + (-1)*k50*x10*k16*k36)/k50,
  diff(x11, t) = (1*k50*x9*x12*k33 + (-2)*k50*k43*x11^2*x13 + 2*k50*k34*x14 + (-3)*k50*k23*k43*x11^3 + 3*k50*k22*k34*x15 + (-1)*k50*k6*x11 + 1*k51*k5*x19 + (-1)*k50*k37*x11 + 1*k50*k37*x14 + 2*k50*k38*x14 + 2*k50*k37*x15)/k50,
  diff(x12, t) = ((-1)*k50*x9*x12*k33 + (-1)*k50*x12*k6 + 1*k51*x22*k5 + 1*k50*k7*(k6*k37 + k5*k37 + k37^2)/(2*k6 + k5 + k37) + (-1)*k50*k37*x12)/k50,
  diff(x13, t) = ((-1)*k50*k43*x11^2*x13 + 1*k50*k34*x14 + (-1)*k50*x13*k9 + 1*k51*x23*k8 + 1*k50*k10*(k9*k38 + k8*k38 + k38^2)/(2*k9 + k8 + k38) + (-1)*k50*k38*x13 + 1*k50*k37*x14)/k50,
  diff(x14, t) = (1*k50*k43*x11^2*x13 + (-1)*k50*k34*x14 + (-1)*k50*k12*x14 + (-1)*k50*k37*x14 + (-1)*k50*k38*x14)/k50,
  diff(x15, t) = (1*k50*k23*k43*x11^3 + (-1)*k50*k22*k34*x15 + (-1)*k50*k12*x15 + (-1)*k50*k37*x15)/k50,
  diff(x16, t) = (1*k51*x17*k13 + (-1)*k50*k46*x16)/k50,
  diff(x17, t) = (1*k51*k1*k11*(k48 + k31*x20^k14/(k2^k14 + x20^k14)) + (-1)*k51*x17*k13 + (-1)*k51*k45*x17)/k51,
  diff(x18, t) = ((-1)*k50*k42*x8*x18 + 1*k50*x10*k24*k42 + 1*k50*x10*k17*k44 + 1*k50*x10*k16*k36 + 1*k50*x16*k27 + (-1)*k50*k39*x18)/k50,
  diff(x19, t) = ((-2)*k51*k43*x19^2*x23 + 2*k51*k34*x20 + (-3)*k51*k23*k43*x19^3 + 3*k51*k22*k34*x21 + 1*k50*k6*x11 + (-1)*k51*k5*x19 + (-1)*k51*k26*x19 + 1*k51*k25*k26*x20 + (-1)*k51*k37*x19 + 1*k51*k37*x20 + 2*k51*k38*x20 + 2*k51*k37*x21)/k51,
  diff(x20, t) = (1*k51*k43*x19^2*x23 + (-1)*k51*k34*x20 + 1*k50*k12*x14 + (-1)*k51*k25*k26*x20 + (-1)*k51*k37*x20 + (-1)*k51*k38*x20)/k51,
  diff(x21, t) = (1*k51*k23*k43*x19^3 + (-1)*k51*k22*k34*x21 + 1*k50*k12*x15 + (-1)*k51*k37*x21)/k51,
  diff(x22, t) = (1*k50*x12*k6 + (-1)*k51*x22*k5 + 1*k51*k26*x19 + 1*k51*k25*k26*x20 + (-1)*k51*k37*x22)/k51,
  diff(x23, t) = ((-1)*k51*k43*x19^2*x23 + 1*k51*k34*x20 + 1*k50*x13*k9 + (-1)*k51*x23*k8 + 1*k51*k25*k26*x20 + (-1)*k51*k38*x23 + 1*k51*k37*x20)/k51 }