# tysons model for cell division
init u=.0075,v=.48,m=1
p k1=.015,k4=200,k6=2,a=.0001,b=.005
global -1 {u-.2} {m=.5*m}
u'=k4*(v-u)*(a+u^2) - k6*u
v'=k1*m - k6*u
m'=b*m
d