Fig. 4.

The photocytotoxicity assay performed in a LoVo and b LoVoDX cells. Cells were incubated with porphyrins during 4 h and then irradiated with two wavelengths (435 and 530 nm) then 24 h of incubation without the compound followed. Each bar represents the mean of at least four separate experiments; bars are the standard errors, *p ≤ 0.005