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Clonogenic studies showing the effect of the calpain antagonist ALLN on photokilling by simultaneous irradiation using NPe6 + BPD. These data represent the average ± SD for 3 experiments. Statistics: * = statistically different from control (p = 0.07); ** (P < 0.002). Bracketed values were different (p < 0.001). Photokilling induced by PDT using BPD or NPe6 only is also shown.
