[11C]N-desmethyl-loperamide, a substrate that selectively images P-glycoprotein function, is trapped in lysosomes. - Pavitra Kannan; Kyle R. Brimacombe; Sami S. Zoghbi; Jeih-San Liow; Cheryl L. Morse; Andrew K. Taku; Sanjay Telu; Victor W. Pike; Christer Halldin; Michael M. Gottesman; Matthew D. Hall; Robert B. Innis (NeuroImage, 2010)