Now let's focus on step six. In step six, we have the Succinate dehydrogenates enzyme that catalyzes this step. And so what happens is these two H atoms, and each one of these H atoms contains one electron each, are abstracted from the succinate. Those two electrons left over form a double bond, a pi bond. And so he formed the fumerate that contains the double bond between these two carbons. And these two H atoms then bind onto the carrier Flaving adenine dinucleotide to form the Fadh two.