Schematic of an inhibitory and excitatory terminal synapsing onto the dendritic shaft of a representative cortical principal neuron. Abbreviations: ABHD6, alpha/beta domain-containing hydrolase 6; CB1, CB1 cannabinoid receptor; CCK, cholecystokinin; COX-2, cyclooxygenase-2; DAGLα, diacylglycerol lipase α; M1, M1 muscarinic receptor; MAGL, monoacylglycerol lipase; mGluR5, metabotropic glutamate receptor 5; NAPE-PLD, N-arachidonoyl phosphatidyl ethanolamine-preferring phospholipase D; PLCβ, phospholipase C β. The increased number of CB1 receptors on the CCK/GABA terminal represents the higher density of CB1 receptors found on these axon terminals.