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A: Lightly and darkly labeled trkA-ir neurons in the paraventricular thalamic nucleus. These neurons were characterized by their small round shape lacking distinct dendritic processes. B: TrkA-ir fibers located within the apical division of the interpeduncular nucleus. C: TrkA-ir neurons scattered within the nucleus of the raphe obscurus. D: TrkA-ir pleomorphic neurons in the medial vestibular nucleus. Scale bars = 20 μm in A, 30 μm in B–D.
