Antigen Binding Fragment
Scheme of an IgM/IgE with its costant (C) and variable (V) regions: 1) antigen binding fragment 2) Fab region 3) Fc regionblue: heavy chainsyellow: light chains
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"IgM%252520IgE%252520scheme."
http://commons.wikimedia.org/wiki/File:IgM_IgE_scheme.png
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