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Internalization of bLf in Vero cells. BLf in its apo (A) or holo (B) forms were conjugated to FITC and synchronously incubated with Vero cells for 0, 30 or 60 min. BLf internalization was observed by laser-scanning confocal fluorescence microscopy. The selected groups of cells are representative of their respective open fields. White bars: 20 μm.
