pro-S-group

例句：

1. 1. The pro-S-group of bacteria is essential for their survival.
   细菌的前体组对其生存至关重要。
2. 2.The study of pro-S-groups has led to new discoveries in the field of chemistry.
   对前体组的研究在化学领域引发了新的发现。
3. 3.Pro-S-groups are often found in the early stages of a chemical reaction.
   在前体组通常出现在化学反应的初期阶段。