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The photokilling effect on HeLa cells treated with 5.5–21.9 μg·mL−1 N-TiO2-Pc or TiO2-Pc with (a) 420–800 nm; (b) 420–575 nm light irradiation. For comparison, cells incubated with the same amount of 0.48–1.9 μg·mL−1 Pc were studied as well. * represents significant difference from the control group (p < 0.05).
