Ready-to-use ELISA kits are available for the detection of IFI-56K, an alias of the protein, interferon induced protein with tetratricopeptide repeats 1. The official gene symbol is IFIT1. The protein, with a mass of 55.4 kDa and length of 478 residues, is reported to be cytoplasmic. It is a member of the IFIT family and may be known by other names, including: IFI-56K, IFI-56, C56, interferon-inducible mRNA 561, interferon-induced 56 kDa protein, and interferon alpha-inducible protein (MW 56kD), and IFIT-1.