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antigens - Coggle Diagram

- - - - surface
        
        of
        
        pathogens
        
        which can start an
        
        immune response
        
        can be
        
        species specific
        
        eg. polio virus only in humans
        
        able to
        
        cross species barriers
        
        1 more item...
        
        all cells
        
        so that
        
        viruses bind to cells
        
        organisms recognize
        
        their own cells
        
        1 more item...
        
        foreign cells/viruses
        
        1 more item...