The five classes of antibodies are:
(a) IgG: Main antibody type in circulation, attacks microorganisms and their foxins.
(b) IgA: Main antibody type in secretions, such as saliva and milk attacks microorganisms and their toxins.
(c) IgE: Antibody responsible for allergic reactions.
(d) IgM: Antibody type found in circulation, largest antibody with 5 submits.
(e) IgD: Antibody type found in immunoglobins.
