Well, I think the citric acid cycle — also known as the tricarboxylic acid cycle (TCA cycle), the Krebs cycle, or more rarely, the Szent-Györgyi-Krebs cycle, [1][2] — is a series of enzyme-catalysed chemical reactions, which is of central importance in all living cells that use oxygen as part of cellular respiration. In eukaryotic cells, the citric acid cycle occurs in the matrix of the mitochondrion. The components and reactions of the citric acid cycle were established by seminal work from Albert Szent-Györgyi and Hans Krebs.
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