%0 Journal Article %A Brian M. Cox %T Agonists at mu opioid receptors spin the wheels to keep the action going %D 2004 %R 10.1124/mol.104.008433 %J Molecular Pharmacology %U https://molpharm.aspetjournals.org/content/molpharm/early/2004/10/20/mol.104.008433.full.pdf