kreatinin

例句：

1. 1.The muscle protein tropomyosin is essential for the function of myofibrils.
   肌原纤维蛋白对于肌肉纤维的功能至关重要。
2. 2. The body produces a variety of proteins to support its growth and repair.
   身体产生各种蛋白质来支持其生长和修复。
3. 3.The amino acid lysine is an important component of many proteins.
   赖氨酸是一种许多蛋白质的重要成分。