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Cannabinoid receptor type 1
The cannabinoid receptor type 1, often abbreviated as CB1, is a G protein-coupled cannabinoid receptor located primarily in the central and peripheral nervous system. It is activated by the endocannabinoid neurotransmitters anandamide and 2-arachidonoylglycerol (2-AG); by plant cannabinoids, such as the compound THC, an active ingredient of the psychoactive drug cannabis; and by synthetic analogues of THC.
==Structure==
The CB1 receptor shares the structure characteristic of all G-protein-coupled receptors, possessing seven transmembrane domains connected by three extracellular and three intracellular loops, an extracellular N-terminal tail, and an intracellular C-terminal tail. These receptors may exist as homodimers or form heterodimers or other GPCR oligomers when coexpressed with one or more classes of G-protein-coupled receptors. Observed heterodimers include A2A–CB1, CB1–D2, OX1–CB1, while many more may only be stable enough to exist in vivo. Recent evidence suggests that these receptors may also possess an allosteric binding site, which may become a target for enhancing the clinical modulatory effects of cannabinoids.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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