Figure 5. Scheme of fluorescence cross-correlation spectroscopy. Green and red fluorophores behave independently before binding, but each fluorescence fluctuates synchronously when both interact

From

Fluorescence Correlation Analysis for Diagnosis Based on Molecular Dynamics

Yasutomo Nomura

Biomedical Science and Engineering. 2016, 4(1), 23-30 doi:10.12691/bse-4-1-3