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(a) 1H and 19F MRI of PIBMAOAm-FSON-IR780 NPs with various concentrations. (b) In vivo 1H and 19F MRI images of 4T1 subcutaneous tumor-bearing BALB/c mice after intravenous (i.v.) injection with PIBMA-FSON-Cy7 polymer and PIBMAOAm-FSON-IR780 NPs, respectively, at different time intervals.
