ornithine cycle

例句：

1. 1.The ornithine cycle is a key process in the synthesis of proteins.
   鸟氨酸循环是合成蛋白质的关键过程。
2. 2. In this study, we investigated the role of the ornithine cycle in cancer metabolism.
   在这项研究中，我们研究了鸟氨酸循环在癌症代谢中的作用。
3. 3. The ornithine cycle is also involved in the production of glutamine, an essential amino acid.
   鸟氨酸循环还涉及到生产谷氨酰胺，一种必需氨基酸。