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ICP-MS quantitative measurement of Si concentrations in each organ of the mice with xenograft tumors. The mice bearing subcutaneous human breast tumors were injected with FMSNs or F-FMSNs. Mice organs were collected and Si concentrations were measured with ICP-MS. The average Si concentrations of each organ of the mice are shown as nanogram of Si per milligram of tissue. The results are shown as mean values ± SD.
