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Cover picture: A grasshopper CNS neuron undergoing axonogenesis in vitro is triple-labeled for membrane (blue), F-actin (green), and arginine kinase (red). Arginine kinase, which is differentially concentrated in active growth cones and filopodia, extends to the tips of leading filopodia (the three color channels are offset by a few pixels to show the spatial disposition of each color; pixels with all three colors are rendered in black). For details, see the article by Wang et al., in this issue (pp. 987-998).