Any substance capable of eliciting an immune response only when attached to a large carrier such as a protein. Examples include dinitrophenols; oligosaccharides; peptides; and heavy metals.
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.