抗体，也叫免疫球蛋白（Ig），是一种能特异性结合抗原的糖蛋白，而抗原是在易感染动物体内引发抗体产生的物质。在体内，抗体是由于外源性分子的侵袭而产生的。抗体以一个或者多个Y字形单体存在，每个Y字形单体由4条多肽链组成，包含两条相同的重链和两条相同的轻链。轻链和重链是根据它们的分子量大小来命名的。Y字形结构的顶端是可变区，为抗原结合部位。任何一个抗体的轻链都可以分为κ或λ型（基于小分子多肽结构上的差异），每一个抗体的重链则决定了它的类或型。
This gene is a member of the inhibitor of apoptosis (IAP) gene family, which encode negative regulatory proteins that prevent apoptotic cell death. IAP family members usually contain multiple baculovirus IAP repeat (BIR) domains, but this gene encodes proteins with only a single BIR domain. The encoded proteins also lack a C-terminus RING finger domain. Gene expression is high during fetal development and in most tumors, yet low in adult tissues. Alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Jun 2011].
备注：图片仅供参考。仅供科研，不可用于临床。
