Cav1 is a family of calcium channels of the L-type that are involved in many basic signalling processes in brain and muscle. Cav1's are not classic cannabinoid receptors but their activity is modulated by cannabinoids. Since cannabinoids have a physiological effect on Cav1's they are effectively cannabinoid receptors.
http://www.guidetopharmacology.org/GRAC/FamilyIntroductionForward?familyId=80
http://en.wikipedia.org/wiki/L-type_calcium_channel
2AG
References:
Pertwee, R.G., Howlett, A.C., Abood, M.E., Alexander, S.P.H., Di Marzo, V., Elphick, M.R., Greasley, P.J., Hansen, H.S., Kunos, G., Mackie, K., et al. (2010). International Union of Basic and Clinical Pharmacology. LXXIX. cannabinoid receptors and their ligands: beyond CB₁ and CB₂. Pharmacol. Rev. 62, 588–631.
Basal ganglia (caudate nucleus, pallidum > putamen), cerebral cortex, hippocampus, substantia nigra, spinal cord. Cerebrum, cerebellum, spinal cord, dorsal root ganglia, lung, small intestine, testis. Skeletal muscle (predominantly transverse tubules) > bone marrow.
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