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The further characterization of the orphan GPCR GPR18 conducted by McHugh et al. in this issue of the British Journal of Pharmacology has generated a pharmacological profile that raises some interesting questions about the nomenclature of this receptor and may also prompt some questions about the pharmacological definition of the classical cannabinoid receptors, CB(1) and CB(2) . LINKED ARTICLES This article is a commentary on McHugh et al., pp. 2414-2424 of this issue and is part of a themed section on Cannabinoids in Biology and Medicine. To view McHugh et al. visit http://dx.doi.org/10.1111/j.1476-5381.2011.01497.x. To view the other articles in this section visit http://dx.doi.org/10.1111/bph.2012.165.issue-8. To view Part I of Cannabinoids in Biology and Medicine visit http://dx.doi.org/10.1111/bph.2011.163.issue-7.
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A 2011 study studied this question.
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