So in the final step, beta keto thylase catalyzes the cleavage of the sigma bond between the second carbon and the third carbon. And so in this particular reaction, the molecule that is the nucleophile is another coenzyme A. So the coenzyme A acts as a nuclear file and uses a thyl group to basically carry out this thylytic cleavage reaction. Now, notice because the reaction took place on the beta carbon of the fatty acid and this was an oxidation reaction, we call this particular pathway the beta oxidation pathway. So this series of four reactions that basically takes place over and over and over until that fully saturated fatty acid is completely converted into these acetyl coenzyme A molecules, is known as the beta oxidation pathway. So once we actually generate those acetyl coenzyme A molecules, they are then fed into the citric acid cycle.