Antigens are an essential component of the human immune system. They are molecules that can trigger an immune response, leading to the production of antibodies. Antigens can be found on the surface of cells, viruses, bacteria, and other microorganisms. They can also be present in food, pollen, and other environmental substances that can cause allergies. In this article, we will explore the definition, origin, and meaning of antigens, as well as their associations, synonyms, and antonyms.
Definitions
An antigen is a substance that can stimulate an immune response, leading to the production of antibodies. It is also known as an immunogen. Antigens can be proteins, carbohydrates, lipids, or nucleic acids. They are usually foreign to the body and can be recognized by the immune system as “non-self.”
Origin
The term “antigen” was first coined by Paul Ehrlich in 1900. The word comes from the Greek words “anti,” meaning “against,” and “gen,” meaning “to produce.” Ehrlich used the term to describe substances that can produce an immune response in the body.
Meaning in different dictionaries
According to the Merriam-Webster dictionary, an antigen is “a substance that when introduced into the body stimulates the production of an antibody.” The Oxford English Dictionary defines it as “a toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.”
Associations
Antigens are associated with the immune system and the production of antibodies. They are also associated with diseases such as allergies, autoimmune disorders, and infections.
Synonyms
Some synonyms of antigen include immunogen, foreign substance, and pathogen.
Antonyms
There are no direct antonyms of antigen, but some related terms include self-antigen and autoantigen.
The same root words
There are no other words with the same root as antigen.
Example Sentences
- The vaccine contains a small amount of antigen to stimulate the immune system.
- Allergies are caused by the body’s reaction to antigens in the environment.
- The immune system can recognize self-antigens and distinguish them from foreign antigens.
- Autoimmune disorders occur when the immune system mistakenly attacks the body’s own antigens.
- The laboratory tests for the presence of specific antigens in the blood.