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Interleukin-29 (IL-29) is a protein that in humans is encoded by the IL29 gene that resides on chromosome 19.
IL-29 is a member of the helical cytokine family and is a type III interferon. It is also known as IFNλ1 and is highly similar in amino acid sequence to the IL-28, the other type III interferon. IL-29 plays an important role in host defenses against microbes and its gene is highly upregulated in cells infected with viruses. IL29 is not present in the mouse genome.