| idiotypic antigenic determinant | The antigenic specificites defined by the unique sequences (idiotopes) of the antigen combining site. Thus anti-idiotype antibodies combine with those specific sequences, may block immunological reactions and may resemble the epitope to which the first antibody reacts. (18 Nov 1997) |
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| antibodies, anti-idiotypic | Antibodies which react with the individual structural determinants (idiotopes) on the variable region of other antibodies. (12 Dec 1998) |
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