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Cytocompatibility examination of ION, ION@PGA, and ION@UPy-NH2 by resazurin assay for (a) HK-2 cells and (b) THP-1 cells, and live/dead staining of (c) HK-2 and (d) THP-1 cells. The living cells were stained green, and the dead cells were stained red. Scale bars represent 200 µm.
