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Fluorescence Resonance Energy Transfer (FRET) occurs when the emission of one fluorophore overlaps the absorbance of a second fluorophore and is proportional to their intermolecular distance (for review, see Wu and Brand, Analytical Biochem, 218, 1-13, 1994). If the donor fluorophore is excited with the appropriate wavelength of light, the result is quenching of its emission and indirect excitation and emission from the acceptor fluorophore.

Developed in the laboratory of Dr. Roger Tsien at UCSD (Miyawaki et al, Nature, 388, 882-887, 1977), FRET using GFP spectral mutants provides the ability to localize and monitor non-binding and molecular protein-protein interaction in living cells.

Glen Spectra Ltd offer filter sets for ratiometric measurement of CFP/YFP or BFP/GFP FRET emission.


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Standard filter sets for fluorescence microscopy

FRET Filters

Filters optimised for FRET studies

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