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Iron oxide nanoparticles as lymphotropic agent. Normal portion of lymph node darkens after infusion of iron oxide nanoparticle while metastatic portion of the node does not darken (white arrow; (a) before and (b) after iron oxide nanoparticle administration). Corresponding sectioned lymph node showing metastasis marked by arrow and the normal portion marked by arrowheads (c). Reprinted with permission from [9].
