👉 The term "cystathionine" is used to describe a specific amino acid found in the body. It's called a cysteine and it plays an important role in various biological processes, including muscle contraction, blood clotting, and protein synthesis. Cysteine is also known as the "essential amino acid" because it is essential for the production of proteins, which are necessary for many bodily functions such as growth, repair, and metabolism. Without cysteine, cells would