Basal total opioid peptide release in the striatum of rats with cholestasis from bile duct resection (BDR): A study by the use of in vivo microdialysis: NV Bergasa, B Mohajer, IM Maisonneuve∗, A Ho, N Maidment†, F. Olive†, MJ Kreek. Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, N Y, ∗Department of Pharmacology and Toxicology, Albany Medical College, Albany, NY, and †Department of Psychiatry and Biobehavioral Sciences, UCLA, Los Angeles, CA