Ryan refers to "The Krebs Citric Acid Cycle", this is referencing a cycle that plays an important part in the cell metabolism. However, it is never called "The Krebs Citric Acid Cycle". It is commonly called the Krebs Cycle, the Citric Acid Cycle, the TCA (Tricarboxylic Acid) Cycle, or very rarely the Szent-Györgyi-Krebs Cycle.