Abstract
Symmetry in antibody plus complement mediated killing between a T15 idiotype-bearing monoclonal antibody (HPC-M2) and an anti-T15 monoclonal antibody (B36-82) is demonstrated. The HPC-M2 antibody is also shown to be multispecific in its effector function, since it lyses both phosphoryleholine coated erythrocytes, and B36-82 Fab coated red blood cells. The symmetry and multispecificity in effector function are presented as new evidence against the concept that the paratope of antibody molecule exists as a uniquely defined site on the antibody variable region. A theoretical consequence for immune system network theory is that the anti-idiotypic set and the internal image are functionally equivalent, the results support symmetric network models of regulation, and are evidence against asymmetric models.
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