Different T-cell receptors can respond to different antigens because of different

A) variable regions in the structure of the receptors.
B) epitopes in the receptor's structure.
C) selection processes.
D) complement binding sites in the receptors.
E) antigenic determinants.

Variable Regions

Parts of antibodies that differ from one antibody to another, enabling them to bind to a specific antigen.

T-cell Receptors

These receptors on the surface of T-cells recognize and bind to antigens presented by other cells, initiating an immune response.

Epitopes

Distinct regions on an antigen that the immune system identifies, particularly through antibodies, B cells, or T cells.