idiotype

noun1

1. •
   A characteristic shared by a group of immunoglobulin or T-cell receptor molecules, based on the antigen-binding specificity of their variable region; and thus, the resultant immunologic phenotype, which can often be specific to a person or to only a small percentage of people.

   • PD mice also lacked serum Ig of 3-83 specificity (3-83 idiotype). — 2000