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IL-26, a member of the IL-10 family produced by memory T cells, monocytes, and NK cells, is expressed at low levels in normal humans. But it is overexpressed in HSV-transformed human T cells, and in rheumatoid arthritis patients, IL-26 is produced primarily by synovial cells. It is highly expressed in the skin, testes, pancreas, heart, placenta, salivary glands, and prostate, but is expressed at low levels in the kidneys, liver, colon, and small intestine. It plays a pro-inflammatory role in rheumatoid arthritis and a role in antitumorigenesis.