Figure 2:Structure of monomeric and secretory IgA antibody.The dimeric form is jointed by the J chain linked to FC region (CH,)by disulfide bonds.IgA is about 15%of human serum immunoglobulin.In the serum it is in the monomeric form.The most important form is in the dimeric form known as secretory IgG.It is found in milk tears,nasal fluid,saliva,perspiration,genitourinary secretion and secretion of the lungs and intestine.Its function is to protect epithelial surfaces from pathogens. Secretory IgA is resistant to protein digestion. FIGURE 3:Structure of lgD igure 4:Structure of IgE Carbohydrate ss the plecenta 160-200kD u2 site for att ment to mess cella Return This page is maintained by the Natural Toxins Research Center at Texas A&M University KingsvilleFigure 2: Structure of monomeric and secretory IgA antibody. The dimeric form is jointed by the J chain linked to FC region (CH3) by disulfide bonds. IgA is about 15% of human serum immunoglobulin. In the serum it is in the monomeric form. The most important form is in the dimeric form known as secretory IgG. It is found in milk, tears, nasal fluid, saliva, perspiration, genitourinary secretion and secretion of the lungs and intestine. Its function is to protect epithelial surfaces from pathogens. Secretory IgA is resistant to protein digestion. Return This page is maintained by the Natural Toxins Research Center at Texas A&M University - Kingsville