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Dehydroergosterol is a naturally occurring, fluorescent analog of cholesterol (ex/em = 324/375 nm) that mimics the properties of cholesterol in cell membranes.[1] It is readily bound by cholesterol-binding proteins and has been used for real-time probing of the sterol environment and to elucidate intracellular sterol trafficking in living organisms.[1]

Porfimer sodium is t he sodium salt of a mixture of oligomers formed by ether and ester linkages of up to eight porphyrin units with photodynamic activity. Absorbed selectively by tumor cells, porfimer produces oxygen radicals after activation by 630 nm w