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T2 mapping MR image of pellets of MDA-MB-231 cells after incubation with SPIONs or HA-SPIONs for 24 h. The cell number in each Eppendorf tube was 1×104, 1×105, or 1×106, respectively.
Abbreviations: HA-SPION, hyaluronan-modified superparamagnetic iron oxide nanoparticle; MR, magnetic resonance.
