About the cover: Heat-map visualization of the expression of cytochrome P450 (CYP) genes in HepaRG cells and their regulation by nuclear receptor agonists (5 μM 3MC, 5 μM CITCO, 10μM Rif, 30 μM tBHQ, 50 μM Wy), O/P (125 μM each), and IL-6 (10 ng/mL). See the article by Braeuning et al. (dx.doi.org/10.1124/dmd.117.078675.)