[a-c]. Subcellular localization of phthalocyanine. Concentration dependent localization of AlPcS2 (1-10 μM) in exponentially growing BMG-1 cells. Cells were incubated with the sensitizer for 2 h in HBSS and observed under fluorescence microscope. 40-50 cells for each treatment group were analyzed from 2-3 different experiments. Representative images at each concentration of AlPcS2 are shown after false coloring.