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Number of microspheres observed in the kidney as a function of microsphere size (A) and distribution of transpulmonary microsphere passage (B) (n = 22). Transpulmonary microsphere passage was observed in 17/22 rats and microsphere size was not related to the number of microspheres found in the kidney (P = 0.27). In the total population, 2,170 ± 4,118 microspheres were found in the kidney.
