%0 Journal Article %A Prem N. Yadav %A Kirti Chaturvedi %A Richard D. Howells %T Inhibition of agonist-induced down regulation of the δ opioid receptor with a proteasome inhibitor attenuates opioid tolerance in human embryonic kidney 293 cells %D 2006 %R 10.1124/jpet.106.113621 %J Journal of Pharmacology and Experimental Therapeutics %U https://jpet.aspetjournals.org/content/jpet/early/2006/12/11/jpet.106.113621.full.pdf