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Photobleaching of PPIX upon irradiation of the porphyrin/BLG complex. At pH 6, there is insignificant difference between irradiated (○) and nonirradiated samples (●) (data are representative of experiments at pH 7 and below). At pH 9, irradiation (□) produces a large photobleaching ,whereas nonirradiated samples (■) do not photobleach (data are representative of experiments at pH 8 and above).
