A cross- reaction is an interaction between an antibody or TCR and
A) homologous antigen.
B) heterologous antigen.
C) either a heterologous or homologous antigen.
D) none of the above.

Question

Quizplus · Accepted Answer

A cross-reaction occurs when an antibody or TCR binds to a molecule that is structurally similar but not identical to its target antigen, known as a heterologous antigen. A homologous antigen would be identical or very similar to the target antigen, and would not cause a cross-reaction. Therefore, choice B is the best answer.

A Cross- Reaction Is an Interaction Between an Antibody or TCR