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Electron microscopy and Perls Prussian blue stain.
Notes: SPIO liposomes (A and B; frame) are clustered within the cytoplasm. Perls Prussian blue stain (C) shows positive reaction in SPIO-labeled EPCs. Cells are shown without SPIO labeling (D) under electron microscopy.
Abbreviations: EPC, epithelial progenitor cell; SPIO, superparamagnetic iron oxide.
