Table 2. Receptor affinity data for THC.

Receptors	hot ligand	source	tissue	Ki(nM)	Ref
CB1	3H-BAY 38-7271	HUMAN	CORTICAL MEMBRANES	13.7	PDSP; [27]
	3H-BAY 38-7271	HUMAN	CLONED	15.3	PDSP; [28]
	3H-CP-55940	HUMAN	CLONED	5.05	PDSP; [29]
				10.19	average
CB2	3H-BAY 38-7271	HUMAN	CLONED	25.06	PDSP; [28]
	3H-BAY 38-7271	HUMAN	CLONED	22.9	PDSP; [27]
	3H-CP-55940	HUMAN	CLONED	44.9	[30]
	3H-CP-55940	HUMAN	CLONED	3.13	PDSP; [29]
				16.85	average
sigma	3H-3-PPP,(+)	RAT	BRAIN	>100,000	PDSP; [31]

Receptor affinity data for THC collected from the literature. The columns identify the receptor, the radioligand used in determining affinity, the source species from which the receptor was used, the tissue from which the receptor was used, the K_i value in nanomoles, and the literature reference from which the data was obtained.