Figure 2.

A plot of the stem cell population using the discrete model (equation 2), age-structured model (equation 5) and continuous model (equation 7). The parameters are taken to be α = 0.02 hours⁻¹, t₀ = 24 hours and n̂₀ = 5. a₃ is chosen such that a₃ = e^αt₀/2 (as in ref. 5).