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a) Confocal microscope images of 4T1 cells and MCF‐7 cells co‐cultured with 200 μg mL−1 PHHPEG6 NFs for 24 h at pH 7.4 and 6.3 and stained with Hoechst 33342. Confocal microscope images of 4T1 cells and MCF‐7 cells treated with 200 μg mL−1 PHHPEG6 NFs for 24 h and stained with Hoechst 33342, b) LysoTracker green and c) ERTracker green, respectively.
