Figure 8. An inclusive model for the assembly of vertebrate retinal cell patterns

A: Inner retinal neurons. A position-dependent, template-derived, inhibitory signaling system (red arrows) prevents like-type (black) cells from occupying nearby space. B: Cone mosaic. 1. A position-dependent, template-derived, inhibitory signaling system (red arrows) prevents like-type (black) cells from occupying nearby space. 2. A position-dependent, template-derived, inductive or permissive signaling system (green arrows) allows unlike-type (gray) cells to occupy nearby space. C: Regenerated retinal patterns. 1. No template and/or failed inhibitory signaling results in no restrictions on (black) cell position. 2. Poor template and/or failed inductive/permissive signaling results in faulty information for (gray) cell position.