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Neurons face a traffic control challenge. They’re constantly sending different sets of proteins to different parts of the cell – and delivery mix-ups can be disastrous. Kelsie Eichel is studying how neurons sort and dispatch proteins, and what happens when deliveries get lost along the way. A better grasp of the basics could help scientists understand why such mishaps are common in neurodegenerative diseases like Alzheimer’s and Parkinson’s.