Anti-URI1 prefoldin like chaperone antibodies are used for the immunodetection of the protein encoded by the URI1 gene. In humans, the canonical protein has a reported length of 535 amino acid residues and a mass of 59.8 kDa. Its subcellular localization is in the nucleus, mitochondria, and cytoplasm. Alternative splicing is reported to yield 4 different isoforms for this protein. It is ubiquitously expressed across many tissue types. A member of the RNA polymerase II subunit 5-mediating protein family, it is known to be involved in gene transcription regulation. Post-translational modifications have been described, including phosphorylation. Other names for this target antigen include NNX3, PPP1R19, RMP, URI, unconventional prefoldin RPB5 interactor 1, and C19orf2. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.