Anti-DEAD box helicase 39b antibodies are protein reagents that detect specific antigens. The DEAD box helicase 39b antigen is another term for the human protein DExD-box helicase 39B, encoded by the DDX39B gene. The protein is known to be involved in nuclear export of spliced and unspliced mRNA. Canonically, it has an amino acid length of 428 residues and a mass of 49 kilodaltons. Its subcellular localization is in the nucleus and cytoplasm and it is widely expressed in many tissue types. The DEAD box helicase 39b protein is a member of the DEAD box helicase protein family.