Anti-UBQLN4 antibodies are used in the immunodetection of the protein ubiquilin 4. In humans, the canonical protein has a reported length of 601 amino acid residues and a mass of 63.9 kDa. Its subcellular localization is in the nucleus, cytoplasmic vesicles, ER, and cytoplasm. Up to 2 different isoforms have been reported for this protein. It is reported to be highly expressed in the pancreas, kidney, skeletal muscle, heart and throughout the brain, and at lower levels in the placenta, lung and liver. UBQLN4 is a reported regulator of protein degradation that mediates the proteasomal targeting of misfolded, mislocalized or accumulated proteins. Synonyms for this target antigen include ataxin-1 ubiquitin-like interacting protein, ataxin-1 ubiquitin-like-interacting protein A1U, connexin43-interacting protein of 75 kDa, and ataxin-1 interacting ubiquitin-like protein. A number of ubqln4 antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA and Immunohistochemistry are also common applications.