NOS3（nitric oxide synthase 3），癌症关联基因，基因ID：4846，一氧化氮是一种反应性自由基，在多种过程中起着生物调节剂的作用，包括神经传递、抗菌和抗肿瘤活性。一氧化氮是由L-精氨酸合成的一氧化氮合酶。这种基因的变异与冠状动脉痉挛的易感性有关选择性剪接和选择性启动子的使用导致多个转录变体[由RefSeq提供，2016年10月]Nitric oxide is a reactive free radical which acts as a biologic mediator in several processes， including neurotransmission and antimicrobial and antitumoral activities. Nitric oxide is synthesized from L-arginine by nitric oxide synthases. Variations in this gene are associated with susceptibility to coronary spasm. Alternative splicing and the use of alternative promoters results in multiple transcript variants. [provided by RefSeq， Oct 2016]。