IL-19: ProductsHuman Interleukin 19 (IL-19) is a member of the IL-10 family of related cytokines. IL-19 contains seven helices and is secreted as a 35 kDa glycosylated monomer. IL-19 expression has been observed in keratinocytes and monocytes. IL-19 binds a receptor complex consisting of IL-20R alpha and the IL-20 R beta. This receptor complex is also shared by IL-20 and IL-24.