Anti-LEU3 antibodies enable researchers to detect and measure the LEU3 antigen in biological samples. This target is a reported synonym of the CD4 gene, which encodes CD4 molecule. This protein is known to function in adaptive immune responses and cell adhesion, among other biological roles. The human version of LEU3 has a canonical amino acid length of 458 residues and a protein mass of 51.1 kilodaltons. It is reported to be localized in the cell membrane of cells and notably expressed in the tonsil, spleen, lymph node, bone marrow, and appendix. Other names for this target antigen include CD4mut, IMD79, and Leu-3. Over 10000 citations in the literature describe the use of LEU3 antibodies in research. These antibodies are most commonly used in Flow Cytometry experiments, among other applications.