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Images of fluorescein-labelled PNA delivered with calix[4]arenes. (A) U251 cell line, (B) HT29 cells. Cell nucleus is marked (dark blue) with Hoechst 33342 dye and taken using DAPI filter (461 nm), while PNA is represented by green spots and acquired using FITC filter (530 nm). Three different magnifications are reported, ×20, ×40, and ×80.
