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Updated: Jun 21, 2026

Characterization of Glycoproteins with the Immunoglobulin Fold by X-Ray Crystallography and Biophysical Techniques
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Characterization and ligand specificity of sheep IgG2 receptor

Songlin Qiao1, Yanyan Yang, Yunchao Liu

  • 1College of Veterinary Medicine, Henan Agricultural University, Zhengzhou, 450002, China.

Immunogenetics
|July 10, 2009
PubMed

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Antibody Structure01:10

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Overview
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Antibody Structure01:10

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Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
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Antibody Structure and Classes

Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
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The Two-State Receptor Model

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Ligand Binding Sites

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