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. 2021 Jan 8;16:201–211. doi: 10.2147/IJN.S271461

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© 2021 Deng et al.

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MRA images of SD rats before and after intravenous injection of SPIO@PEG nanoparticles. High contrast imaging more than 2 h is obtained in the 4-nm SPIO@PEG5k group.