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")
Blake canonical form Blake canonical form In Boolean logic, a formula for a Boolean function "f" is in Blake canonical form (BCF), also called the complete sum of prime implicants, the complete sum, or the disjunctive prime form, when it is a disjunction of all the prime implicants of "f". The Blake canonical form is a disjunctive normal form. The Blake canonical form is not necessarily minimal, however all the terms of a minimal sum are contained in the Blake canonical form. It was introduced in 1937 by Archie Blake, who called it the "simplified canonical form"; it was named in honor of