RT Journal Article SR Electronic T1 Use of plasma and brain unbound fractions to assess the extent of brain distribution of thirty-four drugs: Comparison of unbound concentration ratios to in vivo P-glycoprotein efflux ratios JF Drug Metabolism and Disposition JO Drug Metab Dispos FD American Society for Pharmacology and Experimental Therapeutics DO 10.1124/dmd.106.012294 A1 J. Cory Kalvass A1 Tristan S Maurer A1 Gary M. Pollack YR 2007 UL http://dmd.aspetjournals.org/content/early/2007/01/19/dmd.106.012294.abstract AB