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MRI images of CT-26 colorectal-bearing mice injected with 5-Fu-loaded MNPs (10 mg/kg, contain 2.5 mg/kg Fe). (A) MRI coronal images before the injection of MNPs and (B) 2 h after the injection of MNPs. Orange arrow circle shows the MNP accumulation points as a “dark” core at the T2*-weighted scan.
