What structural feature of an antibody allows it to bind with incredible precision to only one type of antigen?

Answer

The variable regions

The 'arms' of the Y-shaped antibody molecule contain the variable regions. These regions are unique and allow for highly specific binding to a single type of antigen.

What structural feature of an antibody allows it to bind with incredible precision to only one type of antigen?
Productionimmunologyimmune systemantigenantibody