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Luciferase activity in PC9-luc cells PDT-treated with Fl-C2 and Fl-C18 in relative light units: the activities decrease depending on the light irradiation [n = 3, *p < 0.001, **p < 0.05, ***p < 0.005, ****p < 0.0001 vs control, #p < 0.05, ##p < 0.0005 (two-tailed unpaired t-test)].
