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Cellular uptake of Lac-L-calcein in HepG2 cells detected by confocal microscopy. Cells were incubated with phosphate-buffered saline, L-calcein, Lac-L-calcein, and Lac-L-calcein plus 20 mM lactose at the same concentrations of calcein for one hour. (A) Cells treated with L-calcein. (B) Cells treated with Lac-L-calcein. (C) Cells treated with Lac-L-calcein plus 20 mM lactose.
