This class of antibodies is usually found as a pentamer.

Name: This class of antibodies is usually found as a pentamer.
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IgM is the only antibody that is typically found as a pentamer. It is composed of five monomers connected by a J chain, giving it a characteristic "star-like" shape. The pentameric structure of IgM allows it to bind to multiple antigens at once, making it an effective first line of defense during an immune response.

This Class of Antibodies Is Usually Found as a Pentamer