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Fluorescent microscopic images of co-cultured A549 cells with CS-SA/DOX, CS-SA/SiO2/DOX-4, CS-SA/SiO2/DOX-8, and CS-SA/SiO2/DOX-16 at different time points (1, 4, 12, and 24 hours).
Abbreviations: CS, chitosan; DOX, doxorubicin; SA, stearic acid.
