Antibody

Antibodies are large glycoproteins that help protect the body against infection. They bind with a high degree of specificity to molecular structures (antigens) on infectious agents. This can lead to enhanced killing of microbes by phagocytes or complement.

They can be segregated into 5 classes; IgG, IgM, IgE, IgA and IgD. Each of them has differend distribution in the body.