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Para is enriched at the Distal Axonal Segment (DAS) in third instar larval motor neurons. Cross sections through a posterior motor neuron labeled with Split-GAL4 line R-MB050B driving expression of UAS-mCD8::RFP. No axonal Para is detected at the axon hillock (A), where NaV channels cluster in vertebrates. B, Para is enriched at the DAS and is less abundant at a more distal axonal compartment (C). Scale bar, 5 μm. Axis orientation is displayed in i,ii and iii.
