Immunoglobulin pentamer, molecular model. Immunoglobulin (Ig) proteins, also known as antibodies, are gamma globulin proteins that are part of the mam
Immunoglobulin pentamer, molecular model. Immunoglobulin (Ig) proteins, also known as antibodies, are gamma globulin proteins that are part of the mammalian immune system. The Ig monomer is a Y-shaped molecule that consists of four polypeptide chains: two heavy chains (red) and two light chains (white). This form of Ig is IgM, five monomers of which have joined together to form a pentamer. An extra chain, the J chain (purple), helps bind the pentamer together. Pentameric IgM has 10 binding sites compared to the normal two of a monomer.
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Photo credit: © RAMON ANDRADE 3DCIENCIA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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