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self-an·ti·gen

n :  any molecule or chemical group of an organism which acts as an antigen in inducing antibody formation in another organism but to which the healthy immune system of the parent organism is tolerant <an animal generally does not respond to the chemical groupings of its own body, that is, it does not make autoantibodies: antibodies to autologous antigen, or -N. R. Rose>  .
 
 

 
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