Fluorescence resonance energy transfer

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Fluorescence resonance energy transfer (FRET) is a molecular visualization technique where two chromaphores, 2-8 nm apart, transfer energy between each other in a measurable way. The distance between the markers can be accurately calculated from the amount of energy emitted.

Intramolecular FRET has been used to measure the distance between parts of a protein, helping to illuminate the structure. Intermolecular FRET has been used to study ligand-receptor interaction.

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