Anti-CTDSP1 antibodies are used in the immunodetection of the protein CTD small phosphatase 1. In humans, the canonical protein has a reported length of 261 amino acid residues and a mass of 29.2 kDa. Its subcellular localization is in the nucleus. Up to 3 different isoforms have been reported for this protein. CTDSP1 is known to be involved with neuronal differentiation and protein dephosphorylation. Synonyms for this target antigen include CTD (carboxy-terminal domain, RNA polymerase II, polypeptide A) small phosphatase 1, NLI-interacting factor 3, nuclear LIM interactor-interacting factor 3, and carboxy-terminal domain RNA polymerase II polypeptide A small phosphatase 1. CTDSP1 gene orthologs have been reported in the mouse, rat, bovine, frog, chimpanzee and chicken species.