SEARCH Articles Figures Tables Energy resonant Fluorescence energy transfer Fluorescence resonance energy Fluorescence resonance transfer Fluorescence single-molecule Fluorescent resonance energy transfer Fluorescent transfer Molecule fluorescence Molecule fluorescent Molecules energy Molecules resonances Resonance energy Resonance energy transfer single-molecule Resonance fluorescence Resonance transfer Single fluorescent molecules Single molecule fluorescence resonance energy Single molecule fluorescence resonance energy transfer measurements