Table 2.

Effect of low-dose lysosomally-directed PDT on subsequent photokilling directed at mitochondria.

Conditions	Clonogenicity (% control)
No additions	100 ± 13
NPe6/BPD, 660 nm (10 mJ/sq cm)	99 ± 12
NPe6/BPD 690 nm (20 mJ/sq cm)	94 ± 12
NPe6/BPD 660 nm then 690 nm	52 ± 10*

Cells were incubated with both photosensitizing agents and irradiated at 660 nm or 690 nm only, or sequentially at 660 and 690 nm. Data represent mean ± SD for three experiments.

^*Significantly different from untreated controls (p < 0.05).