IUPAC definition : A protein (immunoglobulin) produced by the immune system of an organism in response
to exposure to a foreign molecule (antigen) and characterized by its specific binding
to a site of that molecule (antigenic determinant or epitope).;
A protein (immunoglobulin) produced by the immune system of an organism in response
to exposure to a foreign molecule (antigen) and characterized by its specific binding
to a site of that molecule (antigenic determinant or epitope).