antigen molecule. lock and key principle

wheel space light circle antigen molecule lock key recognition antibodies rendering recognitio recogn principle antibodies antibody antigen antigenic antigens autoantigens disease endogenous epitopes exogenous therapy treatment foreign immune immunity immunogenic protein response immunogenicity immunology induce infection innate immunizations isolated medicine molecular molecule native particle pathogens polysaccharides science species tumor vaccination virus biology biotechnology chemical acquire antibiotics health 3d