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Repetitive T2*-weighted in vivo MRI with in-plane resolution of 156 μm for an allograft on POD 7 (A), POD 14 (B), and POD 20 (C) after MPIO labeling. Few but very distinct contrast spots can be seen and were confirmed by MR microscopy (D), indicated by arrows, which represent MPIO-labeled immune cells, mainly macrophages.
