Fig. 8. A model of Fak56D and CdGAPr control of optic stalk morphogenesis. SG cells distribute along the AP axis. This might be important for anteroposteriorly-elongated morphology of the optic stalk. The mutations of either Fak56D or CdGAPr may cause random distribution of SG cells, which results in a broadened and shortened optic stalk. Cells in the same linage are visualized with the same color. Red arrows indicate directions towards which proliferated cells migrate. Cells in the optic lobe are shown as orange circles. Anterior up, dorsal right.