Map refinement. Wild-type (left) and ki/ki (right) map development for axons in the central retina. The retinal injection site is the same as in Figure 7, top row and central column. The temporal evolution of the map is shown for t = (0, 8, 16, 24, 32, and 100) × 10000 iterations. The orientation of images is the same as in Figure 7. The color map is rescaled in each image for visibility.