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Förster resonance energy transfer (FRET) identifies the co-localization of fluorescent macromolecules on a nanometer scale. FRET between nonidentical and identical fluorophores is called HeteroFRET or HomoFRET, respectively. We applied FRET techniques to analyze the oligomeric state of the core component (BioY) of a bacterial biotin transporter. BioY was fused to fluorescent proteins suitable for...
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