So what conditions do we have to have in the matrix of the mitochondria to actually promote the process of fatty acid synthesis? So, in the matrix of the mitochondria, by the way, this is our matrix, our cytoplasm, the inner and the outer membrane of the mitochondria. So we know that in the matrix we have the citric acid cycle and electron transport chain basically generating ATP molecules. And so when we have high levels of ATP inside the matrix of the mitochondria, we don't want to actually produce any more ATP molecules. We want to stop the process of ATP synthesis. And so what happens is, when there are high levels of ATP in the matrix of mitochondria, that ATP act as an allosteric inhibitor of one of the enzymes of the citric acid cycle.