A dye used in microscopic or electron microscopic examination of cells and tissues to give contrast and to highlight particular features of interest, such as nuclei and cytoplasm.
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.
2-
