Anti-arachidonate 15-lipoxygenase type B antibodies are used for the immunodetection of the protein encoded by the ALOX15B gene. In humans, the canonical protein has a reported length of 676 amino acid residues and a mass of 75.9 kDa. Its subcellular localization is in the nucleus. Alternative splicing is reported to yield 4 different isoforms for this protein. It is reported to be expressed in hair, prostate, lung, ovary, lymph node, spinal cord and cornea. A member of the Lipoxygenase protein family, it is known to be involved with the apoptotic pathway and the metabolism of lipids. Other names for this target antigen include polyunsaturated fatty acid lipoxygenase ALOX15B, 15-LOX-B, 15S-lipoxygenase, arachidonate 15-lipoxygenase 2, and 15-LOX-2. Gene orthologs have been identified in the mouse, rat and chimpanzee species.