Cannabinoids produce a plethora of biological effects, including the modulation of neuronal activity through the activation of CB1 receptors and of immune responses through the activation of CB2 receptors. The selective targeting of either of these two receptor subtypes has clear therapeutic value. Recent evidence indicates that some of the cannabinomimetic effects previously thought to be produced through CB1 and/or CB2 receptors, be they on neuronal activity, on the vasculature tone or immune responses, still persist despite the pharmacological blockade or genetic ablation of CB1 and/or CB2 receptors. This suggests that additional cannabinoid and cannabinoid-like receptors exist. Here we will review this evidence in...
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