| http://www.w3.org/ns/prov#value | - Surprisingly, however, at this later time point, minimal photosensitizer is found in the vasculature. [0031] Thus, the invention is based, at least in part, on the recognition that by administering the sensitizer more than once, i.e., at different time points before applying a stimulating or activating energy, such as light, one can ensure that the sensitizer is located throughout the target tissu
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