A. K. K. T. K. (Primary structure of human creatine kinase)

A. K. K. T. K. refers to the specific sequence of amino acids—the building blocks—found in a key part (the primary structure) of human creatine kinase, an enzyme involved in energy production in muscles and the brain. This sequence, composed of the amino acids Alanine (A), Lysine (K), Lysine (K), Threonine (T), and Lysine (K), determines how the enzyme folds and functions. Understanding this sequence helps scientists learn how the enzyme works, how it differs from other proteins, and how it might be targeted for medical purposes related to muscle and brain energy metabolism.