Anti-Sis1 antibodies are protein reagents that detect specific antigens. The Sis1 antigen is another term for the human protein DnaJ heat shock protein family (Hsp40) member B1, encoded by the DNAJB1 gene. The protein is known to function in brain development and the regulation of transcription, among other biological roles. Canonically, it has an amino acid length of 340 residues and a mass of 38 kilodaltons. Its subcellular localization is in the nucleus and cytoplasm and it is widely expressed in many tissue types. Other alias names for Sis1 include HSPF1, Hdj1, and Hsp40. A number of Sis1 antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA, Immunofluorescence, and Immunohistochemistry are also common applications.