in general speaking
in ABO system if the antigen is present the antibody is absent and if the antibody is present the antigen is absent
these antibodies are natural occuring and responding to bacterial , viruses and some kinds of foods that contianing these antigens
in ABO system if the antigen is present the antibody is absent and if the antibody is present the antigen is absent
these antibodies are natural occuring and responding to bacterial , viruses and some kinds of foods that contianing these antigens
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