Antigen
an antigen
antigens
Immunity
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.
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.
'Foreign' chemicals which get into the blood and provoke an immune response are called antigens.
This is a pH indicator.
pathogenesis
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.
Antigen
antibodies
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!