Increase in the diffusion rate leads to a decrease in spike number.

In all domains, an increase in diffusion of either the activator (DA, top two rows) or the inhibitor (DH, bottom two rows) leads to a decrease in the number of spikes. The ring-like pattern had increased morphogen concentration along a great circle. The values of the diffusion parameters were varied from 20% to 300% of their original values from Table 1.