Fluorescence Cross-correlation Spectroscopy (FCCS) to Observe Dimerization of Transcription Factors in Living Cells

Fluorescence cross-correlation spectroscopy (FCCS) is an established spectroscopic method to observe the interaction between the different fluorescent molecules. Using FCCS, researchers can assess the interaction of target molecules in the aqueous condition, and can apply the technique in cultured cells. Here, we describe the method of FCCS to demonstrate direct observation of dimerization between transcription factors in a living cell.