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Colocalization images of 4T1 cells co‐stained with Se6‐NPs and different commercial dyes, including Lyso‐Tracker Green, ER‐Tracker Green, and Mito‐Tracker Green. The excitation (Ex) and emission (Em) wavelengths for commercial dyes: Ex = 488 nm, Em = 510–540 nm; for Se6‐NPs: Ex = 488 nm, Em = 650–690 nm; scale bar: 10 µm.
