Porphyrins are a class of organic compounds characterized by a large, planar ring structure made up of four pyrrole subunits linked by methine bridges. These compounds play a vital role in various biological processes, particularly in the function of photosensitizers used in photodynamic therapy (PDT) and their ability to absorb light and transfer energy within cells. Porphyrins are central to understanding the mechanisms of action for these therapeutic agents and the development of effective light delivery systems.
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