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Survival fraction against photosensitizer concentration for the photodynamic killing of HeLa cells. Cells (5,000/well) were incubated in complete medium or in serum-free medium (SF) for 30 min with different concentrations of compounds 1 (A), 2 (B), 3 (C), and 4 (D) followed by illumination (light) or not (dark) with 10 J/cm2 of 732-nm laser light. Viability was determined 24 h later by MTT assay.
