👉 Cysteinic is a chemical compound that plays a crucial role in the synthesis of certain proteins and enzymes. It consists of two amino acids, cysteine (Cys) and methionine (Met), which are linked together to form a nitrogenous residue called cysteine thiol. The term "cysteinic" is derived from the Greek word "kystos," meaning "bottle," as the compound is often found in the body's urinary system, where