Figure 2: Bar-chart showing the difference between pre and post PpIX fluorescence levels, represented by PpIX photobleaching of U-87 MG glioma cells subjected to 5, 20 or 40% oxygen and incubated with ALA/MAL/HAL ± CP94. Data represents the mean of 5 wells ± 1 standard deviation, carried out in triplicate (n=3). *represents a significant increase in PpIX photobleaching between cells incubated with ALA/MAL/HAL alone and cells incubated with ALA/ MAL/HAL+CP94 (p<0.05).