The pantothenate kinase enzymes consist of two strands of amino acids that fold into various twists and turns to make a complex 3-D structure.

• 接下来的分析显示，每对相同形状的单体能以一种新颖的方式相互结合，从而形成同一个酶的两个版本，虽然它们看起来不像，但却行使相同的功能。