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 Band Called David A Band Called David a band called David was a group of musicians who provided the instrumental support from 1974 until 1988 for the 2nd Chapter of Acts, a Contemporary Christian music group. The members of the band, without a name, played informally together and attended The Church on the Way in Van Nuys, California, where they met 2nd Chapter of Acts, who also attended there. They chose their name because of a sermon by Pastor Jack W. Hayford describing David as a man after God's heart, as seeking God's heart was an important motivation of the members of the