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The immune response is highly specific for each invader, and that’s because the cells of the adaptive immune response have unique receptors that are able to differentiate friendly bacteria from potentially deadly pathogens from their unique parts - called antigens.
The remainder of the heavy chain makes up the constant region or constant fragment region, also called Fc.
The two heavy chains are linked to one another by disulfide bonds and each heavy chain is also linked to a light chain by a disulfide bond.
Each B cell receptor, has two identical heavy and light chains, resulting in two identical antigen binding sites.
However, the heavy chain actually changes as the B cell develops.
Antibodies, also known as immunoglobulins (Ig), are a type of protein produced by plasma cells as part of the adaptive immune response to foreign substances, such as a virus or bacteria. There are five main classes of antibodies, which are IgA, IgD, IgE, IgG, and IgM, with each class having a different role in fighting the infection.
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