PT - JOURNAL ARTICLE AU - Junyi Ma AU - Yong Zhang AU - Alex E Kalyuzhny AU - Zhizhong Z Pan TI - Emergence of Functional δ-Opioid Receptors Induced by Chronic Morphine AID - 10.1124/mol.105.019109 DP - 2006 Jan 06 TA - Molecular Pharmacology 4099 - http://molpharm.aspetjournals.org/content/early/2006/01/06/mol.105.019109.short 4100 - http://molpharm.aspetjournals.org/content/early/2006/01/06/mol.105.019109.full