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. Succinctoenzyme A, a third intermediate of the citric acid cycle, can be used to form heme groups and porphyrine groups. So remember, these groups are used by enzymes such as hemoglobin and myoglobin. And we also have oxyloacetate that can actually be used in gluconeogenesis to form glucose molecules.