So we see that fatty acid synthesis is driven by the release of carbon dioxide molecules via a decarboxylation step. Now, in addition to this decarboxylation step, we also have reduction steps. And these reduction steps actually utilize reductant molecules. And in the case of fatty acid synthesis, these are NADPH molecules. And a final thing you have to know about fatty acid synthesis is the following. Fatty acid synthesis actually stops at the 16 carbon stage, the palmtate stage.