Antigen Definition:
How Do They Relate to Pathogens?

An antigen is a naturally-occurring substance that is found on the surface of pathogens.    As pathogens travel around, they would accidentally leave bits and pieces of antigens behind, which would serve as clues for our bodies’ defenders (such as white blood cells) to know that a dangerous invader has come into the body.

“Found on the surface of pathogens”

20160513C antigen definition
(Click to enlarge)

Next Generation Science Standards:

HS-LS1-2 Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.

HS-LS1-3 Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis.

What Kind of Science Does this Comic Teach?

Unit: Anatomy

⇒Chapter: Immunology

⇒Topic: Antigen Definition (What Are Antigens?)

Additional Information


Pathogens are microscopic organisms that can cause illnesses and can spread from person to person (contagious).


Proteins are a type of organic molecules that consist of amino acids.  It is frequently found in living things.


Carbohydrates are a type of organic molecules frequently found in living things.  Examples of carbohydrates are sugars, starches, fibers…etc.

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