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Retrograde directional flow analysis by brain histology after post-mortem nanoparticle administration into the deep cervical lymph node. (a) Gold nanorods were identified by the Gold Enhancement technique in the olfactory bulb, the brain parenchyma, and the meningeal lymphatic vessels (red arrows) (n=3). (b) Chinese ink nanoparticles stained the meningeal lymphatic vessels, the brain parenchyma, and the third ventricle wall (red arrows) (n=3).
