Fig. 6. Light-induced cytotoxic response of liposome conjugates in MC28 cells, showing (A) PDT (TPP–Tat liposome conjugates without saporin) and (B) PCI (liposome conjugates conjugates containing both TPP–Tat and saporin) effects. Cells were incubated with various concentrations of TPP–Tat and saporin (TPP–Tat: 25, 50, and 100 nM, saporin: 2.8, 5.7, and 11.4 nM) and were illuminated for up to 5 min. MTT assay was carried out 48 h after light exposure. Data are presented as mean value ± standard deviation (SD) of three independent experiments. *** shows significance P < 0.0001.