Fluorescence micrographs of KG-1 cells treated with calcein-containing liposomes.

KG-1 cells were incubated with f-L-calcein (A) or L-calcein (B) for 1 hour at 37°C and were washed 3 times with cold PBS. Images of the live cells were collected with a digital imaging system, as described in “Materials and methods.” Magnification, × 2000.