NOS2（nitric oxide synthase 2），癌症关联基因，基因ID：4843，一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。该基因编码在肝脏中表达的一氧化氮合酶，并通过脂多糖和某些细胞因子的组合诱导。三个相关的假基因位于17号染色体的Smith-Magenis综合征区域内。[由RefSeq提供，2008年7月]Nitric oxide is a reactive free radical which acts as a biologic mediator in several processes， including neurotransmission and antimicrobial and antitumoral activities. This gene encodes a nitric oxide synthase which is expressed in liver and is inducible by a combination of lipopolysaccharide and certain cytokines. Three related pseudogenes are located within the Smith-Magenis syndrome region on chromosome 17. [provided by RefSeq， Jul 2008]。