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Effect of the 3’-chiral center on cellular retention in lung tumor cells. Replicate 6-well culture plates of lung tumor epithelial cells were incubated for 4 h in culture medium containing 10% FBS and 800 nM of PS 2, 2a or non-chiral PS (9 and 9a). The cells were washed free of PS and imaged at 400× magnification under fluorescence. Cells were incubated in PS-free medium containing 10% FBS for additional 4 and 24 hours.
