1-D numerical simulations of Model A. Simulations demonstrate that local inhibition and lateral-activation of Tgfb2 signalling (i.e. Tgfb2:Tgfbr complex formation) may occur if Fst:Tgfb2 hetero-tetramer diffusion exceeds that of Fst monomers. Pax6 expression was restricted to just the left side of a circular tissue throughout. Simulations were performed using different relative diffusion rates for Fst monomers (x-axis) and Tgfb2 dimers (y-axis), while Fst:Tgfb2 hetero-tetramer diffusion rate was held constant. Simulations are shown three times; first with both Pax6 (red) and activated Tgfb receptor (i.e. Tgfb2:Tgfbr complex; cyan) concentrations together; second with just activated receptor concentrations; third with just Pax6 concentrations.