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. And on top of that, we can also use oxalo acetate to form other amino acids and purity nitrogenous bases as well as pyrimidine nitrogenous bases. So the point is, this is the center of metabolism. All the fuel molecules that we use to break down into ATP, this is where the fuel molecules end up.