G-actin

例句：

1. 1. Actin is a protein that helps muscles contract.
   肌动蛋白是一种帮助肌肉收缩的蛋白质。
2. 2.Actin plays a crucial role in cell division and movement.
   肌动蛋白在细胞分裂和移动中起着至关重要的作用。
3. 3. The study of actin has led to new insights into muscle function.
   对肌动蛋白的研究揭示了肌肉功能的新篇章。