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. Author manuscript; available in PMC: 2012 Apr 21.
Published in final edited form as: J Theor Biol. 2011 Jan 27;275(1):59–69. doi: 10.1016/j.jtbi.2011.01.031

Figure 2.3.

Figure 2.3

(Top) Antigen stimulation rate, a(t) = 0.04 + 2.32 · 1[20,40)(t). (Bottom) Time evolution of the naïve T cell population, N(t), and the activation rate, a(t)N(t). The steady state value of the activation rate is the same as the supply rate s = 0.0016. When the antigen stimulation rate is constant at a, the equilibrium population of naïve T cells equals s/a. The activation rate spikes at the moment that the stimulation rate increases.