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Online Cover This week features a Research Article describing how the phosphorylation status of the guanine nucleotide exchange factor Dock6 determines whether it promotes axon extension or branching in sensory neurons. Mice lacking Dock6 showed impaired axonal extension after injury to the sciatic nerve. The image shows an artist's depiction of a peripheral nerve injury. [Image: Chris Bickel/AAAS]

Science Signaling. ISSN 1937-9145 (online), 1945-0877 (print). Pre-2008: Science's STKE. ISSN 1525-8882