J chain
Protein-coding gene in the species Homo sapiens / From Wikipedia, the free encyclopedia
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The Joining (J) chain is a protein component that links monomers of antibodies IgM and IgA to form polymeric antibodies capable of secretion.[5] The J chain is well conserved in the animal kingdom, but its specific functions are yet to be fully understood. It is a 137 residue polypeptide,[6] encoded by the IGJ gene.[7][8][9]
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