Word parts
What it means
A protein made by plasma cells, which come from B lymphocytes. Each antibody fits one antigenAN-tih-jenA substance, often a protein on a germ or cell, that the immune system recognizes and responds to.anti- against (short for antibody)-gen something that producesFull entry , like a lock and key. There are five classes (IgG, IgM, IgA, IgE and IgD); IgE is the one involved in allergies, and IgG crosses the placenta to protect a newborn. Blood tests for antibodies show past infection, response to a vaccine, or blood type compatibility.
At a glance
| Abbreviations | Ig (immunoglobulin) |
|---|---|
| Spanish | anticuerpo |
| Also written | antibodies |
Easy to confuse with
antigen
A substance, often a protein on a germ or cell, that the immune system recognizes and responds to.
Related terms
vaccine
A product that trains the immune system to protect the body against a specific disease.
immune system
The body's defense system of cells, tissues and organs that fights germs and other foreign substances.
immunization
The process of making a person protected against a disease, most often by giving a vaccine.
white blood cell
A blood cell that is part of the immune system and helps the body fight infection and other foreign material.
antigen
A substance, often a protein on a germ or cell, that the immune system recognizes and responds to.