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Confocal laser scanning microscopy images of HeLa cells incubated with 5(6)-carboxyfluorescein (Cf)-penetratin-pyrrhocoricin (left), Cf-penetratin (middle), and dimerized Cf-penetratin-Cys (right) for 2 h and 24 h. The nuclei were stained with Hoechst 33342. Bars equate to 5 μm.
