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。
The protein encoded by this gene shares similarity with Saccharomyces cerevisiae Rad52, a protein important for DNA double-strand break repair and homologous recombination. This gene product was shown to bind single-stranded DNA ends, and mediate the DNA-DNA interaction necessary for the annealing of complementary DNA strands. It was also found to interact with DNA recombination protein RAD51, which suggested its role in RAD51 related DNA recombination and repair. A pseudogene of this gene is present on chromosome 2. Alternative splicing results in multiple transcript variants. Additional alternatively spliced transcript variants of this gene have been described, but their full-length nature is not known. [provided by RefSeq, Jul 2014]
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