Draw a plausible mechanism for the oxidative decarboxylation of isocitrate by isocitrate dehydrogenase. Draw all missing reactants and/or products in the appropriate boxes by placing atoms on the canvas and connecting them with bonds. Add charges where needed. Electron flow arrows should start on an atom or a bond and should end on an atom, bond, or location where a new bond should be created. Use the molecular structure of nicotinamide instead of NAD structure.