So when the beta ketoaceel ACP reductase domain of ACP uses the reducing power of NADPH, we ultimately generate that D three hydroxybutyl molecule that we have here. So this is a reducing step. Let's move on to step number six. In step number six, we ultimately want to actually remove this hydroxyl group and we want to transform this alcohol into a double bond. And the enzyme that catalyzes this is three hydroxy acyl ACP dehydrates. And again, this is one of the seven catalytic domains that we find on FAS.