Nitric oxide (NO) is a gas of small molecule with toxic properties, but it is also a biologically active substance involved in numerous pathologic and physiologicprocesses.
一氧化氮(NO)是一种不稳定的小分子有害气体，又是一种生物活性物质，参与了多种疾病的病理生理过程。
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It is recently found that relaxin (RLX), a peptide hormone, has an action on heart and vessels, involved in the physiologic and pathological processes of cardiovascular system.