But the TCA cycle, the citric acid cycle is also used to actually produce the building blocks that that are used by ourselves. And this is summarized in this diagram. So Pyruvate is transformed into acetyl coenzyme A-V-A Pyruvate decreboxylation and then vanacetal coenzyme A is fed into the TCA cycle, the citric acid cycle. And in this cycle we not only use vatacetylcoenzyme A to form the ATP molecules v oxidative phosphorylation, but some of the intermediate molecules of the TCA cycle are also actually used to form many building blocks used by the cells of our body. For instance, citrate molecules via specific type of pathway that we're going to focus on in a future lecture, can be used to synthesize fats fatty acid molecules. Alpha key to glutarate another intermediate of the TCA cycle can be used to form glutamate amino acids and other amino acids and we can also actually form purine nitrogenous bases.