{ diff(x1, t) = (1*k29*k1*x1*(1 - x1/k2) + (-1)*k29*(k3*k4^k5*k7/(x1^k5 + k4^k5*k7)/(1 + k25*x6*k7)*k7*x1 + k8*x5*x1))/k29,
  diff(x2, t) = (-1)*k29*k12*x1*x2/k29,
  diff(x3, t) = (1*k29*k12*x1*x2 + (-1)*k29*k13*x3)/k29,
  diff(x4, t) = (1*k29*(k14*x3/(1 + k15*x5) + k11*k9*x1*k7/(k6 + k10 + k9*x1*(1 + k15*x5))) + (-1)*k29*k16*x4)/k29,
  diff(x5, t) = (1*k29*k18*x4*(1 - x5/k17) + (-1)*k29*(k20*x5*x1 + k19*x5))/k29,
  diff(x6, t) = (1*k29*(k21*k20*x5*x1 + k22*k19*x5 + k23*k13*x3) + (-1)*k29*k24*x6*k7)/k29 }