<P> One of the primary sources of acetyl - CoA is from the breakdown of sugars by glycolysis which yield pyruvate that in turn is decarboxylated by the enzyme pyruvate dehydrogenase generating acetyl - CoA according to the following reaction scheme: </P> <Dl> <Dd> CH C (= O) C (= O) O pyruvate + HSCoA + NAD → CH C (= O) SCoA acetyl - CoA + NADH + CO </Dd> </Dl> <Dd> CH C (= O) C (= O) O pyruvate + HSCoA + NAD → CH C (= O) SCoA acetyl - CoA + NADH + CO </Dd> <P> The product of this reaction, acetyl - CoA, is the starting point for the citric acid cycle . Acetyl - CoA may also be obtained from the oxidation of fatty acids . Below is a schematic outline of the cycle: </P>

Where is atp produced in citric acid cycle