An organic molecule or ion (usually a metal ion) that is required by an enzyme for its activity. It may be attached either loosely (coenzyme) or tightly (prosthetic group).
A chemical compound that can be excited by light of a specific wavelength and subsequently transfer energy to a chosen reactant. This is commonly molecular oxygen within a cancer tissue, which is converted to (highly rective) singlet state oxygen. This rapidly reacts with any nearby biomolecules, ultimately killing the cancer cells.
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