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Confocal fluorescence microscopy of A375 cells after treatment with RGD-P-Ce6 and Lysotracker Green. (a) Lysosomes labelled by Lysotracker green, (b) RGD-P-Ce6, (c) yellow regions indicate localization of RGD-P-Ce6 in the lysosomes and (d) DIC. Scale bar, 50μm.