{ diff(x1, t) = (1*k26*k15*x6 + (-1)*k26*k14*(k21 + (x5 + x6 + x11 + x12)^k23)/(k24^k23 + (x5 + x6 + x11 + x12)^k23)*x1 + (-1)*k26*k13*x1 + 1*k26*k12*x3*x2 + (-1)*k26*k16*x8*x1 + 1*k26*k17*x10)/k26,
  diff(x2, t) = ((-1)*k26*k16*x8*x2 + 1*k26*k17*x9 + 1*k26*k15*x5 + (-1)*k26*k14*(k21 + (x5 + x6 + x11 + x12)^k23)/(k24^k23 + (x5 + x6 + x11 + x12)^k23)*x2 + 1*k26*k13*x1 + (-1)*k26*k12*x3*x2)/k26,
  diff(x3, t) = 1*k26*(k3*(k27 - x3)/(k1 + k27 - x3) - k4*x16*x3/(k2 + x3))/k26,
  diff(x4, t) = 0,
  diff(x5, t) = ((-1)*k26*k16*x8*x5 + 1*k26*k17*x11 + (-1)*k26*k15*x5 + 1*k26*k14*(k21 + (x5 + x6 + x11 + x12)^k23)/(k24^k23 + (x5 + x6 + x11 + x12)^k23)*x2 + 1*k26*k19*x11 + (-1)*k26*k18*x5*x7)/k26,
  diff(x6, t) = ((-1)*k26*k15*x6 + 1*k26*k14*(k21 + (x5 + x6 + x11 + x12)^k23)/(k24^k23 + (x5 + x6 + x11 + x12)^k23)*x1 + 1*k26*k19*x12 + (-1)*k26*k16*x8*x6 + 1*k26*k17*x12 + (-1)*k26*k18*x6*x7)/k26,
  diff(x7, t) = 1*k26*k10*piecewise(0, x5 - k11 < 0, 1)/k26,
  diff(x8, t) = ((-1)*k26*k16*x8*x2 + (-1)*k26*k16*x8*x5 + 1*k26*k17*x9 + 1*k26*k17*x11 + (-1)*k26*k16*x8*x1 + (-1)*k26*k16*x8*x6 + 1*k26*k17*x10 + 1*k26*k17*x12)/k26,
  diff(x9, t) = (1*k26*k16*x8*x2 + (-1)*k26*k17*x9 + 1*k26*k13*x10 + (-1)*k26*k12*x3*x9 + 1*k26*k15*x11 + (-1)*k26*k14*(k21 + (x5 + x6 + x11 + x12)^k23)/(k24^k23 + (x5 + x6 + x11 + x12)^k23)*x9)/k26,
  diff(x10, t) = ((-1)*k26*k13*x10 + 1*k26*k12*x3*x9 + 1*k26*k16*x8*x1 + (-1)*k26*k17*x10 + 1*k26*k15*x12 + (-1)*k26*k14*(k21 + (x5 + x6 + x11 + x12)^k23)/(k24^k23 + (x5 + x6 + x11 + x12)^k23)*x10)/k26,
  diff(x11, t) = (1*k26*k16*x8*x5 + (-1)*k26*k17*x11 + (-1)*k26*k19*x11 + (-1)*k26*k18*x11*x7 + (-1)*k26*k15*x11 + 1*k26*k14*(k21 + (x5 + x6 + x11 + x12)^k23)/(k24^k23 + (x5 + x6 + x11 + x12)^k23)*x9)/k26,
  diff(x12, t) = ((-1)*k26*k19*x12 + (-1)*k26*k18*x12*x7 + 1*k26*k16*x8*x6 + (-1)*k26*k17*x12 + (-1)*k26*k15*x12 + 1*k26*k14*(k21 + (x5 + x6 + x11 + x12)^k23)/(k24^k23 + (x5 + x6 + x11 + x12)^k23)*x10)/k26,
  diff(x13, t) = (1*k26*k18*x12*x7 + 1*k26*k18*x11*x7 + (-1)*k26*k19*x13)/k26,
  diff(x16, t) = 1*k26*(k7*(1 - x16)/(k5 + 1 - x16) - k8*x2*x16/(k6 + x16))/k26 }