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。
caution:The sequence shown here is derived from an Ensembl automatic analysis pipeline and should be considered as preliminary data.,developmental stage:Isoform 2 is expressed at lower levels in fetal brain and kidney than in adult brain and kidney.,similarity:Belongs to the TPD52 family.,subunit:Forms homodimer or heterodimer with other members of the family.,tissue specificity:Isoform 2 is expressed in colon, breast, prostate, pancreas and kidney tumor cell lines. Isoform 2 is expressed at high levels in kidney, prostate, brain, small intestine and pancreas, at moderate levels in placenta and colon, at low levels in lung, liver and heart, and at very low levels in spleen, thymus, peripheral mononuclear blood cells, testis and ovary.
备注：图片仅供参考。仅供科研，不可用于临床。
