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Cellular uptake of the ZnPc photosensitizers (● ZnPc-(Lys)5, ○ ZnPc-S2P2, ▼ ZnPc-S4) in a) BGC-823 cells and b) HELF cells after 2 h incubation with each photosensitizer at various concentrations. Values represent the mean of three separate experiments; bars represent standard error of the mean (SEM). c) The internalization of ZnPc photosensitizers by K562 cells after 2 h incubation.
