Table 1. Measurement of the surface expression of GPCRs by intact cell ligand binding assays.

Receptors	Radioligands	References
α1-AR (α1A- and α1B-AR)	[3H]-Prazosin (Phentolamine)	Duvernay, 2009a and 2009b; Zhang et al., 2011; Li et al., 2017
α2-AR (α2A-, α2B- and α2C-AR)	[3H]-RX821002 (Rauwolscine)	Dong and Wu, 2007; Dong et al., 2008; Duvernay 2009a and 2009b; Dong et al., 2010a and 2010b; Zhang et al., 2011; Filipeanu et al., 2015; Li et al., 2017; Wei et al., 2019
β-AR (β1- and β2-AR)	[3H]-CGP12177 (Alprenolol)	Dong and Wu, 2007; Dong et al., 2008; Duvernay 2009a and 2009b; Dong et al., 2010a and 2010b; Zhang et al., 2011; Filipeanu et al., 2015; Li et al., 2017; Wei et al., 2019
AT1R and AT2R	[125I]-Ang II (Ang II)	Filipeanu et al., 2004; Dong and Wu, 2007; Dong et al., 2008; Duvernay et al., 2009a and 2009b; Dong et al., 2010b; Zhang et al., 2011
M3-MR	[3H]-NMS (Atropine)	Dong et al., 2010b