{ diff(x1, t) = ((-1)*k1*k19*x1 + 1*k1*k127*k136*x2 + (-1)*k1*k128*x1)/k1,
  diff(x2, t) = (1*k1*k22*k137 + (-1)*k1*k49*x2 + (-1)*k1*k127*k136*x2 + 1*k1*k128*x1)/k1,
  diff(x3, t) = ((-1)*k1*k46*x3 + 1*k1*k50*x33*x4/(k51 + x4))/k1,
  diff(x4, t) = (1*k1*k46*x3 + (-1)*k1*k50*x33*x4/(k51 + x4))/k1,
  diff(x5, t) = (1*k1*k2*x3*x6/(k3 + x6) + (-1)*k1*k90*x5)/k1,
  diff(x6, t) = ((-1)*k1*k2*x3*x6/(k3 + x6) + 1*k1*k90*x5)/k1,
  diff(x7, t) = (1*k1*k4*x5*x8/(k5 + x8) + (-1)*k1*k17*x15*x7/(k18 + x7))/k1,
  diff(x8, t) = ((-1)*k1*k4*x5*x8/(k5 + x8) + 1*k1*k17*x15*x7/(k18 + x7))/k1,
  diff(x9, t) = (1*k1*k6*x7*x10/(k7 + x10) + 1*k1*k20*x31*x10/(k21 + x10) + 1*k1*k78*x54*x10/(k79 + x10) + (-1)*k1*k87*x9)/k1,
  diff(x10, t) = ((-1)*k1*k6*x7*x10/(k7 + x10) + (-1)*k1*k20*x31*x10/(k21 + x10) + (-1)*k1*k78*x54*x10/(k79 + x10) + 1*k1*k87*x9)/k1,
  diff(x11, t) = (1*k1*k8*x9*x12/(k9 + x12) + (-1)*k1*k44*x7*x11/(k45 + x11) + 1*k1*piecewise(k117*x31*x67/(k118 + x67), x31 <= 1, 0) + 1*k1*piecewise(k119*x31*x59/(k120 + x59), x31 <= 1, 0) + 1*k1*piecewise(k121*x31*x65/(k122 + x65), x31 <= 1, 0) + 1*k1*piecewise(k123*x31*x63/(k124 + x63), x31 <= 1, 0) + 1*k1*piecewise(k125*x31*x62/(k126 + x62), x31 <= 1, 0))/k1,
  diff(x12, t) = ((-1)*k1*k8*x9*x12/(k9 + x12) + 1*k1*k44*x7*x11/(k45 + x11))/k1,
  diff(x13, t) = (1*k1*k10*x1*x14/(k11 + x14) + 1*k1*k12*x5*x14/(k13 + x14) + (-1)*k1*k14*x13 + 1*k1*k64*x46*x14/(k65 + x14))/k1,
  diff(x14, t) = ((-1)*k1*k10*x1*x14/(k11 + x14) + (-1)*k1*k12*x5*x14/(k13 + x14) + 1*k1*k14*x13 + (-1)*k1*k64*x46*x14/(k65 + x14))/k1,
  diff(x15, t) = (1*k1*k15*x13*x16/(k16 + x16) + 1*k1*k27*x19*x16/(k28 + x16) + 1*k1*k32*x23*x16/(k33 + x16) + 1*k1*k34*k139*x16/(k35 + x16) + (-1)*k1*k36*k140*x15/(k37 + x15) + 1*k1*k38*x26*x16/(k39 + x16) + 1*k1*k40*k141*x16/(k41 + x16) + (-1)*k1*k42*k142*x15/(k43 + x15))/k1,
  diff(x16, t) = ((-1)*k1*k15*x13*x16/(k16 + x16) + (-1)*k1*k27*x19*x16/(k28 + x16) + (-1)*k1*k32*x23*x16/(k33 + x16) + (-1)*k1*k34*k139*x16/(k35 + x16) + 1*k1*k36*k140*x15/(k37 + x15) + (-1)*k1*k38*x26*x16/(k39 + x16) + (-1)*k1*k40*k141*x16/(k41 + x16) + 1*k1*k42*k142*x15/(k43 + x15))/k1,
  diff(x17, t) = 0,
  diff(x18, t) = 0,
  diff(x19, t) = (1*k1*k23*x13*x20/(k24 + x20) + (-1)*k1*k25*k138*x19/(k26 + x19))/k1,
  diff(x20, t) = ((-1)*k1*k23*x13*x20/(k24 + x20) + 1*k1*k25*k138*x19/(k26 + x19))/k1,
  diff(x21, t) = 0,
  diff(x22, t) = ((-1)*k1*k29*x19*x22/(k30 + x22) + 1*k1*k31*x23)/k1,
  diff(x23, t) = (1*k1*k29*x19*x22/(k30 + x22) + (-1)*k1*k31*x23)/k1,
  diff(x24, t) = 0,
  diff(x25, t) = 0,
  diff(x26, t) = ((-1)*k1*k113*x31*x26/(k114 + x26) + 1*k1*k115*x13*x73/(k116 + x73))/k1,
  diff(x27, t) = 0,
  diff(x28, t) = 0,
  diff(x29, t) = (1*k1*k47*x15*x30/(k48 + x30) + (-1)*k1*k88*x29)/k1,
  diff(x30, t) = ((-1)*k1*k47*x15*x30/(k48 + x30) + 1*k1*k88*x29)/k1,
  diff(x31, t) = ((-1)*k1*k108*x32*x31/(k109 + x31) + 1*k1*k110*x58)/k1,
  diff(x32, t) = (-1)*k1*k107*x32/k1,
  diff(x33, t) = (1*k1*k52*x1*x34/(k53 + x34) + (-1)*k1*k54*x33 + 1*k1*k58*x37*x34/(k59 + x34))/k1,
  diff(x34, t) = ((-1)*k1*k52*x1*x34/(k53 + x34) + 1*k1*k54*x33 + (-1)*k1*k58*x37*x34/(k59 + x34))/k1,
  diff(x35, t) = 0,
  diff(x36, t) = (1*k1*k55*k144 + (-1)*k1*k56*x36 + (-1)*k1*k129*k143*x36 + 1*k1*k130*x37)/k1,
  diff(x37, t) = ((-1)*k1*k57*x37 + 1*k1*k129*k143*x36 + (-1)*k1*k130*x37)/k1,
  diff(x38, t) = 0,
  diff(x39, t) = 0,
  diff(x40, t) = (1*k1*k80*k146 + (-1)*k1*k82*x40 + (-1)*k1*k131*k145*x40 + 1*k1*k132*x41)/k1,
  diff(x41, t) = ((-1)*k1*k84*x41 + 1*k1*k131*k145*x40 + (-1)*k1*k132*x41)/k1,
  diff(x42, t) = (1*k1*k81*k147 + (-1)*k1*k83*x42 + (-1)*k1*k133*k145*x42 + 1*k1*k134*x43)/k1,
  diff(x43, t) = ((-1)*k1*k85*x43 + 1*k1*k133*k145*x42 + (-1)*k1*k134*x43)/k1,
  diff(x44, t) = (1*k1*k60*x41*x45/(k61 + x45) + (-1)*k1*k93*x44)/k1,
  diff(x45, t) = ((-1)*k1*k60*x41*x45/(k61 + x45) + 1*k1*k93*x44)/k1,
  diff(x46, t) = (1*k1*k62*x43*x47/(k63 + x47) + (-1)*k1*k94*x46)/k1,
  diff(x47, t) = ((-1)*k1*k62*x43*x47/(k63 + x47) + 1*k1*k94*x46)/k1,
  diff(x48, t) = (1*k1*k66*x44*x49/(k67 + x49) + (-1)*k1*k89*x48)/k1,
  diff(x49, t) = ((-1)*k1*k66*x44*x49/(k67 + x49) + 1*k1*k89*x48)/k1,
  diff(x50, t) = (1*k1*k70*x44*x51/(k71 + x51) + 1*k1*k72*x48*x51/(k73 + x51) + 1*k1*k74*x52*x51/(k75 + x51) + (-1)*k1*k86*x50)/k1,
  diff(x51, t) = ((-1)*k1*k70*x44*x51/(k71 + x51) + (-1)*k1*k72*x48*x51/(k73 + x51) + (-1)*k1*k74*x52*x51/(k75 + x51) + 1*k1*k86*x50)/k1,
  diff(x52, t) = (1*k1*k68*x44*x53/(k69 + x53) + (-1)*k1*k91*x52)/k1,
  diff(x53, t) = ((-1)*k1*k68*x44*x53/(k69 + x53) + 1*k1*k91*x52)/k1,
  diff(x54, t) = (1*k1*k76*x50*x55/(k77 + x55) + (-1)*k1*k92*x54)/k1,
  diff(x55, t) = ((-1)*k1*k76*x50*x55/(k77 + x55) + 1*k1*k92*x54 + (-1)*k1*k135*x55*x74)/k1,
  diff(x56, t) = 0,
  diff(x57, t) = 0,
  diff(x58, t) = (1*k1*k108*x32*x31/(k109 + x31) + (-1)*k1*k110*x58)/k1,
  diff(x59, t) = (1*k1*k95*x45*x60/(k96 + x60) + (-1)*k1*piecewise(k119*x31*x59/(k120 + x59), x31 <= 1, 0))/k1,
  diff(x60, t) = (-1)*k1*k95*x45*x60/(k96 + x60)/k1,
  diff(x61, t) = (-1)*k1*k97*x53*x61/(k98 + x61)/k1,
  diff(x62, t) = (1*k1*k97*x53*x61/(k98 + x61) + (-1)*k1*piecewise(k125*x31*x62/(k126 + x62), x31 <= 1, 0))/k1,
  diff(x63, t) = (1*k1*k99*x49*x64/(k100 + x64) + (-1)*k1*piecewise(k123*x31*x63/(k124 + x63), x31 <= 1, 0))/k1,
  diff(x64, t) = (-1)*k1*k99*x49*x64/(k100 + x64)/k1,
  diff(x65, t) = (1*k1*k101*x51*x66/(k102 + x66) + (-1)*k1*piecewise(k121*x31*x65/(k122 + x65), x31 <= 1, 0))/k1,
  diff(x66, t) = (-1)*k1*k101*x51*x66/(k102 + x66)/k1,
  diff(x67, t) = (1*k1*k103*x55*x68/(k104 + x68) + (-1)*k1*piecewise(k117*x31*x67/(k118 + x67), x31 <= 1, 0))/k1,
  diff(x68, t) = (-1)*k1*k103*x55*x68/(k104 + x68)/k1,
  diff(x69, t) = 1*k1*k105*x47*x70/(k106 + x70)/k1,
  diff(x70, t) = (-1)*k1*k105*x47*x70/(k106 + x70)/k1,
  diff(x71, t) = 1*k1*k111*x55*x72/(k112 + x72)/k1,
  diff(x72, t) = (-1)*k1*k111*x55*x72/(k112 + x72)/k1,
  diff(x73, t) = (1*k1*k113*x31*x26/(k114 + x26) + (-1)*k1*k115*x13*x73/(k116 + x73))/k1,
  diff(x74, t) = (-1)*k1*k135*x55*x74/k1,
  diff(x75, t) = 1*k1*k135*x55*x74/k1 }