Protocol to request
            
                Receptor purification, labeling, and nanodisc reconstitution
                
                
            
        
        
            
                Research Article
            
            
                Distinct activation mechanisms of CXCR4 and ACKR3 revealed by single-molecule analysis of their conformational landscapes
                
            
            
            
                Christopher T Schafer et al.
            
            
                DOI: 10.7554/eLife.100098