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Confocal microscopic images of nuclei (A, B, C), FITC-Tf-IONPs (D, E, F), TRITC-IONPs (G, H, I), merged images (J, K, L), and H&E staining (M, N, O) of tumor sections, collected from 4T1-tumor-bearing mice at different time points (1, 3 and 24 hours) after co-injection of FITC-Tf-IONPs and TRITC-IONPs. The scale bar for all images is 200 µm.
