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(a) Viability of HeLa cells when treated with HP (△), SPIONs (◇), and SPION@HP (◻); (b) dose-dependent cytotoxicity of DOX-loaded SPION@HP (●) and free DOX (◆) after 48 h of incubation; and (c) image of HeLa cells incubated with free DOX and DOX-loaded SPION@HP at 10 μg mL−1. Data are expressed as mean ± SD (n = 3).
