: Found at the tips of the "Y" arms, this region determines the antibody's specificity . It contains the paratope , which binds to a specific part of an antigen called an epitope .
: Forms the base and lower parts of the arms. It determines the antibody's class and how it interacts with other parts of the immune system. Fab and Fc Fragments : antibody
An , also known as an immunoglobulin (Ig) , is a specialized Y-shaped protein produced by the immune system to identify and neutralize foreign substances like bacteria, viruses, and toxins. These invaders are known as antigens . 1. Structure of an Antibody : Found at the tips of the "Y"
: The two arms that bind to antigens.