And because this occurs in the mitochondrial matrix, we have six multiplied by three. So 18 ATP molecules are formed when the six NADH end up on the electron transport chain. Because we have two fadh two molecules and each one forms two ATP, we have a total of four ATP molecules form when the fadh twos are on our electron transport chain. And finally, we form two GTP molecules as a result of substrate level phosphorylation. And each one of these GTPs is transformed into our ATP. So we have two ATP molecules for a total of 24 ATP molecules that are formed in the citric acid cycle after our electron transport chain basically undergoes the oxidative phosphorylation.