Medical Term:

antigen excess

 

Definition:

  1. in a precipitation test, the presence of uncombined antigen in excess of that required to combine with all of the antibody; precipitation may be inhibited because the presence of excess antigen gives rise to soluble antigen-antibody complexes;
  2. in vivo, the resultant antigen-antibody interaction in such an antigen excess may give rise to immune complexes, which have a potential to induce cellular damage; could be tolerogenic.
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