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Alex Kolodkin is a professor of neuroscience at the Johns Hopkins University School of Medicine. His research is focused on understanding how neuronal connectivity is established during development. As a postdoctoral fellow, Dr. Kolodkin discovered and cloned the first semaphorin gene in the grasshopper. More recently, his team decoded the activity of protein signals involved in muscle-nerve connections in fruit flies. His team is investigating how families of invertebrate and vertebrate guidance cues orchestrate neuronal wiring during embryogenesis and later in neural development, using Drosophila and the mouse as model systems.