Illustration of B cell receptors on the surface of a B cell (purple and orange phospholipid bilayer). B cells, also known as B lymphocytes are a type of white blood cell. B cell receptors (BCR) are transmembrane proteins located on the surface of B cells. BCRs are composed of an antibody (light blue) and a CD79 (dark blue) protein within the membrane. B cell activation is initiated by the binding of an antigen (red), such as a bacterial or viral protein, to a BCR. The binding of polyvalent (multiple binding sites) antigens induces clustering of BCR complexes, causing dimerisation. This is followed by CD79 triggering a signalling cascade within the B cell, causing it to produce and release further antibodies.
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TPG33828494
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達志影像
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RF
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