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1/T1 (A) and 1/T2 (B) as function of Larmor frequency for MION-46L-labeled (0.5 mg Fe/ml) and MION-46L-OX-26-labeled (0.05 mg Fe/ml) cells. The dependence of 1/T2 on TE is indicative of (intra)cellular clustering of the magnetic nanoparticles.
