Immunoglobulin A (IgA) Monomeric-Serum IgA ~15-20%of serum immunoglobulins 2 Heavy and 2 Light ·2 Subclasses(IgA1 and IgA2) Found in serumImmunoglobulin A (IgA) ◼ Monomeric- Serum IgA ◼ ~15-20% of serum immunoglobulins ◼ 2 Heavy and 2 Light ◼ 2 Subclasses (IgA1 and IgA2) ◼ Found in serum