Ready-to-use ELISA kits are available for the detection of Interferon-stimulated protein, an alias of the protein, interferon stimulated exonuclease gene 20. The official gene symbol is ISG20. The protein, with a mass of 20.4 kDa and length of 181 residues, is reported to be cytoplasmic and nuclear. It is a member of the Exonuclease superfamily and may be known by other names, including: HEM45, interferon stimulated exonuclease gene 20kDa, estrogen-regulated transcript 45 protein, and interferon-stimulated gene 20 kDa protein.