Anti-DEAD box helicase 19b antibodies are used for the immunodetection of the protein encoded by the DDX19B gene. In humans, the canonical protein has a reported length of 479 amino acid residues and a mass of 53.9 kDa. Its subcellular localization is in the nucleus and cytoplasm. Alternative splicing is reported to yield 4 different isoforms for this protein. A member of the DEAD box helicase protein family, it is an ATP-dependent RNA helicase involved in mRNA export from the nucleus. Other names for this target antigen include DDX19, RNAh, ATP-dependent RNA helicase DDX19B, ATP-dependent RNA helicase DDX19, DEAD (Asp-Glu-Ala-As) box polypeptide 19B, and DBP5. Gene orthologs have been identified in the mouse and rat species.