Table 1.

The list of techniques used to determine homo- and/or heterodimerization.

Method	Receptors	References
Complementation Assay	Somatostatin receptors 1, 4 and 5	[21,36]
	Calcium sensing receptor	[41]
	Muscarinic M2 and M3 receptors	[42]
	Muscarinic M3/α2 Adrenoceptor	[22]
	Dopamine receptor 2/3	[43]
	GABAR1/GABAR2	[44]
Co-Immunoprecipitation	α,β-Adrenoceptors	[45,46]
	Dopamine receptors	[47,48]
	Opioid receptors	[49,50]
	Chemokine receptor 2	[51]
	Somatostatin receptors	[31,32,34,35,36,52]
	Somatostatin receptor 2/µ-Opioid receptor	[53]
	β-Adrenoceptors/Somatostatin receptor 5	[37,40]
	Somatostatin receptor 2A/3	[52]
	Angiotensin receptor 1/Cannabinoid receptor1	[54]
	β2 Adrenoceptor/Opioid receptor	[55]
	GABAR1/GABAR2	[56,57]
	Calcium sensing receptor/Glutamate Receptors	[58]
FRET	α-Adrenoceptors	[45]
	Thyrotropin receptor	[59]
	Neuropeptide Y receptor	[60]
	Dopamine receptor 2	[61]
	Chemokine receptor 2 and 5	[62]
	Somatostatin Receptors	[63,64]
Photobleaching-FRET	Somatostatin receptors	[21,31,32,34,36,38]
	Gonadotrophin-releasing hormone receptors	[65,66]
	Somatostatin receptors/Dopamine receptor	[30,35]
	Somatostatin receptor 5/β-Adrenoceptors	[37,40]
	Somatostatin receptor 4/µ-Opioid receptor	[67]
	Somatostatin receptor 4/δ-Opioid receptor	[39]
	Somatostatin receptors/EGFRs	[15,16,17]
BRET	β-Adrenoceptors	[68]
	Thyrotropin-releasing hormone receptor	[69]
	Opioid receptors	[70]
	Chemokine receptor 4 and 5	[71]
	Adenosine receptor	[72,73]
	Oxytocin Receptor	[10]
	Vasopressin Receptor	[10]
	Adenosine 2a receptor/Dopamine receptor 2	[73]
	Adenosine 2a receptor/Purinergic receptor 2	[72]
	Oxytocin/Vasopressin receptors	[10]
	Angiotensin receptor 1/Cannabinoid receptor 1	[54]
TR-FRET	δ-Opioid receptor	[74]
	β2 Adrenoceptor/δ Opioid receptors	[74]
	Histamine 4 receptor	[75]
	GABAR1/GABAR2	[76]