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Fluorescence microscopy images of MCF-7 cells treated for 6 h and 24 h with free Ser NPs and DOX-loaded Ser NPs, as compared with an untreated MCF-7 monolayer: green fluorescence–phalloidin–FITC: actin filaments; blue fluorescence–DAPI: cell nuclei; red fluorescence–DOX). Scale bar: 50 μm.
