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")
Conjunctive normal form formula_30 and formula_31 with a new variable, and repeating as often as necessary. To convert first-order logic to CNF: As an example, the formula saying ""Anyone who loves all animals, is in turn loved by someone"" is converted into CNF (and subsequently into clause form in the last line) as follows (highlighting replacement rule redices in formula_71): Informally, the skolem function formula_72 can be thought of as yielding the person by whom formula_60 is loved, while formula_74 yields the animal (if any) that formula_60 doesn't love. The 3rd last line from below then reads as ""formula_60 doesn't love the animal