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In vivo PET/MR imaging of [89Zr]Mn3O4@PEG NPs. (a) Serial in vivo PET imaging of [89Zr]Mn3O4@PEG in BALB/c mice at different post-injection time points; (b) Serial in vivo MR imaging of Mn3O4@PEG in BALB/c mice at different postinjection time points (n = 3 per group).
