EXPERIMENTAL FIGURE 18-54 Localization of actin (red), microtubules (green), and acetylated microtubules (blue) in a small growth cone. Notice how the stable acetylated microtubules are localized to the shaft of the axon and do not penetrate into the dynamic growth cone. [Republished with permission of Elsevier: from Bent, E.W. and Gertler, F.B., “Cytoskeletal Dynamics and Transport in Growth Cone Motility and Axon Guidance,” Neuron, 2003, 40:209–227.]