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Polymer-coated nanoparticles are widely used for drug delivery in cancer therapy. However, it is not clear whether the polymer coating is disrupted in the lipid bilayer or intracellular space. Our current work suggests that the polymer coating of inorganic nanoparticles is disrupted after internalization by cancer cells. Single dispersed red quantum dots (QDs) labeled with 5-carboxyfluorescein (5-FAM)...