Have you ever heard the term ANTIGEN? Let’s see what it means.

Antigens are any foreign molecules present on the pathogens which initiate the immune response. Our body recognizes these antigens as non-self and acts against it. There can be many different antigens present on a single pathogen. Hence, @FuzzySynapse thought of illustrating it as different keys on a single pathogen.

I hope next time you hear the word “Antigen”, you would remember it must be some specific “key” of pathogen with which it’s trying to invade our body!