Presents abstracts of studies on biotransformation and drug transport, presented at the Experimental Biology/International Union of Physiological Sciences 2005 congress held in San Diego, California. "Ontogeny of Brain Mdr1a Expression: Implications for Cyclosporine A Neurotoxicity in Young Children," by Philip Acott, David Worth et al.; "Regulation of the Multidrug Resistance-Associated Protein 3 by Bile Acids," by Tanya Christina McCarthy, Xiufeng Li and Christopher J. Sinal; "Differences in the Inhibition of Cytochromes P450 3A4 and 3A5 by Metabolite-Inhibitor Complex Forming Drugs," by Jason Boer, Kyle Allen et al.