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MR images of labeled cells in agar (1 × 106 cells) acquired using T2-weighted imaging with the FRFSE sequence. (a)–(e) indicate the iron ion concentration (from 8.4 to 21 μg/mL, resp.). The numbers 1–5 represent the iRGD peptide concentration (from 0.25 to 1.25 μg/mL, resp.).
