Immunoglobulin A only weakly. IgA exists in two isotypes, IgA1 and IgA2. They are both heavily glycosylated proteins. While IgA1 predominates in serum (~80%), IgA2 percentages are higher in secretions than in serum (~35% in secretions); the ratio of IgA1 and IgA2 secreting cells varies in the different lymphoid tissues of the human body: Both IgA1 and IgA2 have been found in external secretions like colostrum, maternal milk, tears and saliva, where IgA2 is more prominent than in the blood. Polysaccharide antigens tend to induce more IgA2 than protein antigens. Both IgA1 and IgA2 can be in membrane-bound form. ("see B-cell receptor")
Bangor Academy and Sixth Form College Bangor Academy and Sixth Form College Bangor Academy and Sixth Form College ("informally" Bangor Academy) is a secondary school located in Bangor, Co Down, Northern Ireland. The school was formed as part of a merger between the Bangor High for Girls school and Gransha Boys' High school. The name for the newly formed school was Bangor Academy and Sixth Form College. Mr. AWJ Hyndman was appointed to be the school's first Principal. The motto of Gransha Boys' High school was 'Conando Progredimur' ("endeavour to be better"). The school was eventually bulldozed and cleared in 2008. The schools officially merged in