Varying Diffusion and Degradation Parameters

<div><p>Computer model of gene network, scaled to <i>Drosophila</i> length (0.5 mm). Diffusion parameters are varied for mRNA (Dm), protein (Dp), and T7 activator (DX). Data are plotted as percentage of total output protein (y-axes) against chamber position (x-axes), for 10-min simulations.</p> <p>(A) Outputs for protein A.</p> <p>(B) Output for protein B. Graphs with “target behaviour” are shaded grey, and the four asterisks mark the parameter sets used to generate outputs for proteins A and C.</p> <p>(C) Outputs for protein C.</p> <p>(D) Effect of adding protease degradation to B-output, shown at 15-min intervals, over a 2.5-h time course (parameters: DX = 0.43 μm²s⁻¹; Dm = Dp = 0.02 μm²s⁻¹; t_1/2 = 770 s).</p>