Unlike other antibodies, IgA can be secreted out in pairs, or a dimeric form called secretory IgA, which is literally two IgA antibodies attached together.

与其他抗体不同，IgA可以以成对体形式分泌，也就是两个IgA连接在起。

Now, IgA comes in subclasses—IgA1 and IgA2, IgA1 is found mainly in the serum while IgA2 is more often found in the mucus secretions, typically in its dimeric form.

IgA分两个亚型：IgA1和IgA2；IgA1主要存在中，IgA2主要以体形式存在粘膜分泌液中。

The Jun (c-Jun, JunB, JunD) and Fos (c-Fos, FosB, Fra1, Fra2) proteins are components of the dimeric activator protein-1 (AP-1) transcription factor complex.

Jun (c-Jun、JunB、JunD) 和 Fos (c-Fos、FosB、Fra1、Fra2) 蛋白是体激活蛋白-1 (AP-1) 转录因子复合物的组成部分。