mammals( http://en.wikipedia.org/wiki/Antibody ) Antibody isotypes of mammals|| Name || Types || Description || Antibody Complexes || IgA 2 Found in mucosal areas, such as the gut , respiratory tract and urogenital tract , and prevents colonization by pathogens . [ 10 [[ http://en.wikipedia.org/wiki/Antibody#cite_note-9 |]]] Also found in saliva, tears, and breast