And what that implies is all the carbon atoms that are found in that fatty acid chain that is synthesized in this process, they come from acetyl coenzyme A and not from that carbon dioxide. So carbon dioxide is ultimately removed from that fatty acid chain. It does not contribute to those carbon atoms. So, again, very important step because it allows us to drive the equilibrium of this reaction toward the product side. So ultimately, it's the indirect action of ATP that sets up this reaction and allows us to undergo this decarboxylation step that drives this reaction forward. Now, let's move on to step number five.