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J. Huwyler, J. Drewe, C. Klusemann, G. Fricker: Evidence for P-glycoprotein-modulated penetration of morphine-6-glucuronide into brain capillary endothelium. In: British journal of pharmacology. Band 118, Nummer 8, August 1996, S. 1879–1885, ISSN0007-1188. PMID 8864518. PMC 1909885 (freier Volltext).