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Dark toxicity in HeLa cells (A), A549 cells (B), and HUVEC cells (C) of the DSP cross-linked NP, the glutaraldehyde cross-linked NP and free Ce6 at different drug concentrations after a 24 h incubation. Asterisks indicate statistical significance with *p<0.05, ** p<0.001, and *** p < 0.0001.
