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THE IMMUNE SYSTEM - Coggle Diagram

- - - - In order to work properly, the immune system must identify the foreign cells, organisms and substances calles ANTIGENS
        
        The immune system can memorize the process it uses in order to be ready to defend against known pathogens every time it is necessary
        
        The surface proteins are antigens too and they are also present in the uman body, the immune system doesn't usually works against them because it recognise them as SELF
        
        An AUTOIMMUNE reaction occours when the immune system identifies self cells as NON-SELF