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In vivo nanoparticle lymphatic migration in pig intestine: 50 nm IR-813 encapsulated eNP are seen migrating from the subserosal injection site within the small bowel (arrow) through easily identifiable lymphatic channels to a single mesenteric draining lymph node (arrowhead). Shown are representative color (left), NIR fluorescence (middle), and a pseudo-colored (red) merged(right) images, 4 minutes after injection. Scale bar = 1 cm.
