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")
A Boy Called Dad audience favorite at the festival. The film has since gone on to screen in at the 4th International Rome Film Festival, the CineMagic in Belfast, and to a home crowd at the Salford Film Festival. "A Boy Called Dad" was released on DVD on 14 August 2010. A Boy Called Dad A Boy Called Dad (2009) is a British feature film, produced by Made Up North Productions. It is the feature film debut of director Brian Percival, screenwriter Julie Rutterford, and producers Michael Knowles and Stacey Murray, and co-producer Mark John (Vision Thing). It stars Ian Hart and Kyle Ward