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Confocal laser scanning microscopy (CLSM) images of HeLa cells transfected with Cy5-labelled DNA by Lys-14-10 and Lys-His at the optimal transfection N/P ratio at different times. For each row, from left to right: Cy5-labelled pGL-3 DNA (red); lysosomes and acidic late endosomes stained by LysoTracker green (green); cell nucleus stained by Hoechst 33342 (blue) and merged image.
