dx1/dt=(x2*p5)/(p6+x2)-(x1*p1)/(((x8/p2)^p3+1)*(p4+x1));
dx2/dt=(x1*p1)/(((x8/p2)^p3+1)*(p4+x1))-(x2*p5)/(p6+x2);
dx3/dt=(x4*p13)/(p14+x4)-(x3*x2*p7)/(p8+x3);
dx4/dt=(x5*p11)/(p12+x5)-(x4*p13)/(p14+x4)+(x3*x2*p7)/(p8+x3)-(x4*x2*p9)/(p10+x4);
dx5/dt=(x4*x2*p9)/(p10+x4)-(x5*p11)/(p12+x5);
dx6/dt=(x7*p21)/(p22+x7)-(x6*x5*p15)/(p16+x6);
dx7/dt=(x8*p19)/(p20+x8)-(x7*p21)/(p22+x7)+(x6*x5*p15)/(p16+x6)-(x7*x5*p17)/(p18+x7);
dx8/dt=(x7*x5*p17)/(p18+x7)-(x8*p19)/(p20+x8);
y1=x6;
y2(0)=x7;
y3(0)=x8;
x1(0)=90;
x2(0)=10;
x3(0)=280;
x4(0)=10;
x5(0)=10;
x6(0)=280;
x7(0)=10;
x8(0)=10


