Ready-to-use ELISA kits are available for the detection of ILTIF, an alias of the protein, interleukin 22. The official gene symbol is IL22. The protein, with a mass of 20 kDa and length of 179 residues, is reported to be secreted. It is a member of the IL-10 family and may be known by other names, including: ILTIF, IL-TIF, IL-22, IL-21, cytokine Zcyto18, and IL-10-related T-cell-derived inducible factor, and zcyto18.