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By electron microscopy, pTrkB-ir is most prominent in axons throughout the hippocampal formation. A, In the stratum lucidum, pTrkB-ir (arrowheads) is found in axon bundles (a) most likely belonging to the mossy fiber pathway, and in myelinated axons (ma). B, In CA1 stratum radiatum, SIG pTrkB-ir (arrowhead) is found in axons near the plasma membrane. Scale bars, 0.5 μm.
