Cover legend: The hydrophilic domain of rat mitochondrial electron transport chain complex I is involved in the production of cellular ATP. During epileptogenesis, arginine 76 (orange spheres) of the 75 kDa subunit (purple ribbon) is irreversibly modified by carbonylation, leading to decreased complex I activity. This residue is located at the interaction interface between the 75 kDa subunit and the 51 kDa subunit (green ribbons), proximal to the NADH binding site (red sticks) and the sulfur-iron center involved in the initial transfer of electrons into the chain (yellow and purple sticks). For more information, see the article by Ryan et al. (pages 11250–11258).