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Dehydroergosterol (DHE) is a naturally occurring fluorescent sterol analog that is a compound for real-time detection elaboration of the sterol environment and intracellular sterol transport in organisms. Dehydroergosterol is a cholesterol mimetic that binds to cholesterol-binding proteins and can be used for real-time imaging of living cells. Dehydroergosterol is a cholesterol mimetic that binds to cholesterol-binding proteins and can be used for real-time imaging of living cells.

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