Ready-to-use ELISA kits are available for the detection of U5-100KD, an alias of the protein, DEAD-box helicase 23. The official gene symbol is DDX23. The protein, with a mass of 95.6 kDa and length of 820 residues, is reported to be nuclear. It is a member of the DEAD box helicase family, DDX23/PRP28 subfamily and may be known by other names, including: U5 snRNP 100 kD protein, PRP28p homolog, DEAD box protein 23, DEAD (Asp-Glu-Ala-Asp) box polypeptide 23, 100 kDa U5 snRNP-specific protein, and probable ATP-dependent RNA helicase DDX23, and SNRNP100.