Fig 14. Steady state spatial gradients of Dl of different diffusion rates.

The steady state spatial gradients of Dl are due to diffusion and degradation. The red solid line with triangular markers is the steady state gradient formed with the diffusion coefficient 1.2 μm ² s ⁻¹. The green dash line with square markers is the gradient of the diffusion coefficient 4.8 μm ² s ⁻¹. The blue dotted line with circle markers is of the diffusion coefficient 9.6 μm ² s ⁻¹. The black straight lines represents the 0.05 Dl concentration threshold for cellular response.