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Cover picture: Hippocampal neurons growing in culture typically elaborate a single axon and several equivalent minor processes (not yet dendrites). Immunofluorescent staining reveals the dense arrays of microtubules (green) and F-actin (red) that serve as tracks for the movement of mitochondria and other organelles within the processes. Although F-actin is most highly concentrated at the growth cones, it is present and supports mitochondrial movement throughout the processes. For details, see the article by Ruthel and Hollenbeck in this issue (pages 8618-8624).