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Electron micrograph of mouse lung 1 h postinjection of preloaded, prelabeled rat Sertoli cells. As illustrated in this image, pulmonary capillaries in the lungs of injected mice contained cellular debris (arrows) and intracapillary densities (asterisk) similar in appearance to aggregated labeled nanoparticles. Inset: Electron micrograph of aggregated labeled nanoparticles (asterisk).
