Not only the IgG but there are special antibodies called secretory IgA and these are highly enriched in mucosal fluids in the mucus lining of your gut, and the eye, and of other--of mucosal organs.

不仅仅是IgG分子,还有一些特殊的抗体,被称作分泌型免疫球蛋白A,IgA在体内粘液中广泛存在,例如,在小肠内壁和眼球周围以及,其他带有粘膜的器官中都有IgA的分布

耶鲁公开课 - 生物医学工程探索课程节选