CNTN5（contactin 5），癌症关联基因，基因ID：53942，这个基因编码的蛋白质是免疫球蛋白超家族的一员，也是接触蛋白家族的成员，在神经系统发育过程中介导细胞表面的相互作用。这种蛋白是一种糖基磷脂酰肌醇（gpi）锚定的神经膜蛋白，起着细胞粘附分子的作用。它可能在发育中的神经系统轴突连接的形成中起作用另外，编码不同亚型的剪接转录变体已经被描述为该基因[由RefSeq提供，2011年8月]The protein encoded by this gene is a member of the immunoglobulin superfamily， and contactin family， which mediate cell surface interactions during nervous system development. This protein is a glycosylphosphatidylinositol (GPI)-anchored neuronal membrane protein that functions as a cell adhesion molecule. It may play a role in the formation of axon connections in the developing nervous system. Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq， Aug 2011]。