This illustration serves to demonstrate the structure of a single catalytic αβ pair of ATP synthase. From this perspective, it is apparent that the catalytic site resides at the αβ interface, but predominantly within the beta; subunit (green), as evidenced by the localization of the bound ligand (adenosine diphosphate (ADP), inorganic phosphate (P_i), and Mg²⁺). This image was created using 3D software for modeling and rendering, and Photoshop for post-production.