Antigen
Antigenan·ti·gen/ˈantijən/Noun:A toxin or other foreign substance that induces an immune response in the body, esp. the production of antibodies.
Is a substance produced in response to an anti-gen.
This substance has a general name called an antigen.
The lack of an immune response to a foreign compound entering the body is called "tolerance." This phenomenon can occur naturally, as in the case of self-tolerance, where the immune system does not attack the body's own tissues. It can also be induced artificially, such as in the context of organ transplants or certain therapies, where the goal is to prevent an immune response against a foreign substance.
The substance that the body regards as foreign, which includes viruses, bacteria, toxins, and transplanted organs, is called an "antigen." Antigens trigger an immune response, as the immune system identifies them as potentially harmful invaders. This response can lead to the production of antibodies and activation of immune cells to eliminate the threat.
Depending on the exact response, the substance is generally called a pathogen, yet more specifically depending on the nature of the response and origin of the substance, could be an antigen, allergen, carcinogen, etc.
The substance that coats B cells, enabling them to recognize foreign proteins, is called immunoglobulin, or antibodies. These antibodies are membrane-bound forms of immunoglobulin that serve as B cell receptors (BCRs). They specifically bind to antigens, which are foreign proteins, facilitating the immune response.
Antigen
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Antigen
An immune response is based on the ability to distinguish molecules that are part of the body ("self") from those that are not ("nonself," or foreign). Such molecules that can elicit an immune response are called antigens.
Pathogen.Pathogens can be things like viruses or bacteria which have things called antigens on them. These antigens are proteins on the pathogen that let the body know that the pathogen is potentially dangerous. This induces the immune response.Hope this helps!