Anti-USP19 antibodies are used in the immunodetection of the protein ubiquitin specific peptidase 19. In humans, the canonical protein has a reported length of 1318 amino acid residues and a mass of 145.7 kDa. Its subcellular localization is in the ER. Alternative splicing is reported to yield 7 different isoforms for this protein. A member of a the Peptidase C19 protein family, USP19 is a type of deubiquitinating enzyme that regulates the degradation of various proteins. Synonyms for this target antigen include ubiquitin carboxyl-terminal hydrolase 19, deubiquitinating enzyme 19, ubiquitin specific protease 19, ubiquitin thioesterase 19, and ZMYND9.