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新的信息分子一氧化氮（ＮＯ）可在几乎所有的哺乳动物细胞内产生。它是一个相对稳定的气体自由基，带有一个不配对的电子，能与体内一些生物活性分子如Ｏ－２发生反应，形成新的自由基（如二氧化氮自由基ＮＯ２·和羟自由基ＯＨ·），引发体内自由基的链式反应，加强己经存在
The new information molecule nitric oxide (NO) can be produced in almost all mammalian cells. It is a relatively stable gaseous radical with an unpaired electron that reacts with some bioactive molecules in the body, such as O-2, to form new free radicals (such as NO2 · and hydroxyl radicals OH ·), triggering a chain reaction of free radicals in the body, strengthening already exists