RT Journal Article SR Electronic T1 Muscarinic modulation of synaptic transmission via endocannabinoid signalling in the rat midbrain periaqueductal grey JF Molecular Pharmacology JO Mol Pharmacol FD American Society for Pharmacology and Experimental Therapeutics DO 10.1124/mol.108.045872 A1 Benjamin K Lau A1 Christopher W Vaughan YR 2008 UL http://molpharm.aspetjournals.org/content/early/2008/08/04/mol.108.045872.abstract AB