Cheat Sheets 5 Types of Immunoglobulins Mnemonic November 29, 2017November 29, 2017 Staff 0 Comments Immunoglobulins exist in five types—IgA, IgD, IgE, IgG, and IgM. Each type serves a particular function: • IgA, IgG, and IgM guard against viral and bacterial invasion. • IgD acts as an antigen receptor of B cells. • IgE causes an allergic response.