I have two couple ODEs and the second one has a delay in the time for starting. I mean, the first ODE starts at t=0 and the second one at t=20. How can I solve the second one in the correct time after the first one has already started to be solved?
the system is:
NDSolve[{
mRNA'[t] == im (1 - Exp[-Kb Yab] - Kdm mRNA[t],
P'[t] == Kt mRNA[t] - Kdp P[t], mRNA[0] == 0,
P[0] == 0}, {mRNA[t], P[t]}, {t, 0, 400}]