Difference between Antigen and Antibody


Difference between Antigen and Antibody

TopicAntigenAntibody
Other namesImmunogensImmunoglobulins
DefinitionA substance that trigger an immune responseA type of protein that binds to antigen
OriginCan be found on external source or within the bodyWithin the body
Molecular typeProteins, lipids, polysaccharides, and nucleic acid.Proteins
Binding siteEpitopeParatope
Effects on the bodyIt is responsible for causing a disease or an allergic reaction.It protects the body from harmful microorganisms.
Significance/importanceIt controls what goes in and out of the cell.It protects the body from infection, especially in the case of a virus attack.
PrevalenceFound in almost all types of cells (bacteria, viruses, and fungi)Present in some type of cells. (11)
Location/Where can they be found?Antigens are hook on the cell’s surface and are present in every cell.Antibodies are found in various parts of the body including the following:
  • IgA – It is found in the ears, eyes, vagina, digestive tract, nose, breathing passages, and saliva.
  • IgD – It is found on the tissue lining of the chest and abdomen.
  • IgG – It is present in all body fluids.
  • IgE – It is found in the mucous membranes, lungs, and skin.
  • IgM – It is found in the lymph fluid and the blood. (5, 9, 10, 11, 12)
AppearanceAntigen image photo pictureAntibody image photo picture

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