to render a target molecule more reactive (e.g. more easily oxidized) by the addition to it of a second type of molecule, often a dye, that absorbs light energy and transfers it to the target molecule.
p. plants. — some plants carry primary photodynamic agents, e.g. Hypericum perforatum. Others are hepatotoxic or carry mycotoxin-producing fungi that are, and are indirectly photosensitizing in that they interfere with the excretion of phylloerythrin through the animal's biliary system.
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