Anti-NBPF member 4 antibodies are used in the immunodetection of the protein encoded by the NBPF4 gene. In humans, the canonical protein has a reported length of 638 amino acid residues and a mass of 72.1 kDa. Its subcellular localization is in the cytoplasm. It is notably expressed in testis. The NBPF member 4 protein is a member of the NBPF protein family. Other names for this target antigen include neuroblastoma breakpoint family member 4.