Figure 14.1 — Optically guided neuronal growth Figure 14.1 — Optically guided neuronal growth. Flat (top row) and tubular (bottom row) neuronal growth cones. In each experiment, the position of the laser spot is highlighted with a circle. Frames are shown at time intervals of 10 minutes (top) and 5 minutes (bottom).Reprinted from Ehrlicher et al., Proc. Natl. Acad. Sci. U.S.A. 99, 16 024–8. Copyright (2002) National Academy of Sciences, U.S.A.