Anti-nudix hydrolase 9 antibodies are used in the immunodetection of the protein encoded by the NUDT9 gene. In humans, the canonical protein has a reported length of 350 amino acid residues and a mass of 39.1 kDa. Its subcellular localization is in the mitochondria. Alternative splicing is reported to yield 2 different isoforms for this protein. It is widely expressed across many tissue types. A member of the Nudix hydrolase protein family, it is known to be involved with metabolic processes. Other names for this target antigen include ADP-ribose pyrophosphatase, mitochondrial, ADP-ribose diphosphatase, ADP-ribose phosphohydrolase, ADP-ribose pyrosphosphatase NUDT9, and NUDT10.