Anti-LEU-9 antibodies enable researchers to detect and measure the LEU-9 antigen in biological samples. This target is a reported synonym of the CD7 gene, which encodes CD7 molecule. This protein is known to function in adaptive immune responses, among other biological roles. The human version of LEU-9 has a canonical amino acid length of 240 residues and a protein mass of 25.4 kilodaltons. It is reported to be localized in the membrane of cells and notably expressed in the tonsil, spleen, rectum, colon, and appendix. Other names for this target antigen include GP40 and TP41. Some LEU-9 antibodies may have been used in research and have associated citations. These antibodies are most commonly used in Flow Cytometry experiments, among other applications.