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a Viability of HeLa cells treated with free Ce6, NGO–PEG–Ce6, and NGO–PEG–BPEI–Ce6 at different concentrations of Ce6. b Ce6 fluorescence intensity in HeLa cells treated with Ce6, NGO–PEG–Ce6, and NGO–PEG–BPEI–Ce6 for various times
[Taken from reference (Miao et al. 2013)]
