 Alternatively spliced transcript variants encoding the distinct isoforms have been described.Interleukin-19 is a cytokine that belongs to the IL-10 family of cytokines along with several other interleukins including IL-10, IL-20, IL-22, IL-24, IL-26, and several virus-encoded cytokines.It signals through the same cell surface receptor (IL-20R) that is used by IL-20 and IL-24.