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 of Governors Mrs Doreen Tennis. Prince Edward was given a tour of the school facilities and demonstrations from the Duke of Edinburgh scheme participants. He unveiled a plaque to commemorate the occasion in the school Assembly hall attended by over 500 pupils and staff. A number of the school's alumni have excelled in the fields of sport and politics at local, regional and national levels. 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