Anti-niban apoptosis regulator 1 antibodies are used for the immunodetection of the protein encoded by the NIBAN1 gene. In humans, the canonical protein has a reported length of 928 amino acid residues and a mass of 103.1 kDa. Its subcellular localization is in the cytoplasm. It is reported to be expressed in various types of thyroid tumor such as papillary thyroid carcinomas and oxyphilic thyroid tumors but not in normal thyroid tissue. A member of the Niban protein family, it is reported to regulate phosphorylation of a number of proteins involved in translation regulation including EIF2A, EIF4EBP1 and RPS6KB1. Other names for this target antigen include cell growth-inhibiting gene 39 protein, family with sequence similarity 129 member A, and protein Niban 1. Gene orthologs have been identified in the mouse, rat, bovine, zebrafish, chimpanzee and chicken species.