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Effect of sublethal photodynamic treatment on dark toxicity of ZnTnHex-2-PyP. After 10 cycles of sublethal photodynamic treatment and regrowth, cells were resuspended in PBS to OD600 = 0.5, and incubated in the dark for 50 min with ZnTnHex-2-PyP (2.0–20 μM). Immediately after the incubation, glucose was added to 0.2% and MTT test was performed.
