Antibodies
(a) As a germ-line B cell matures, an enzyme called DNA recombinase randomly excises V and J segments from the light chain gene. Splicing at the mRNA level results in further gene rearrangement. As a result, (b) each antibody has a unique variable region capable of binding a different antigen.
Source
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"OpenStax College, Antibodies. October 17, 2013."
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OpenStax CNX
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