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Uptake of polymers (upper row) and polymer-Dox conjugates (lower row) labeled by fluorescent dye Dyomics-633 (coloured in orange), nucleus stained with Hoechst 33342 (coloured in blue), after incubation of parental murine mammary 4T1 cell line for 24 h with fluorescently labeled polymers A) HD-P+Dy-633, B) LD-P-30+Dy-633 and C) LD-P-45+Dy-633 and polymer-drug conjugates D) HD-P+Dox/Dy-633, E) LD-P-30+Dox/Dy-633 and F) LD-P-45+Dox/Dy-633 at 37°C and 5 % CO2.
