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HeLa cell viability after incubation with DSP cross-linked NP and glutaraldehyde cross-linked NP as a function of the Ce6 concentration after 1, 6, and 24 h of incubation. Two-tailed t-test was used to establish significance at each individual time point; Asterisks indicate statistical significance with *p<0.05 and *** p < 0.0001.
