Anti-MEKKK3 antibodies enable researchers to detect and measure the MEKKK3 antigen in biological samples. This target is a reported synonym of the MAP4K3 gene, which encodes mitogen-activated protein kinase kinase kinase kinase 3. This protein is known to function in intracellular signal transduction and protein phosphorylation, among other biological roles. The human version of MEKKK3 has a canonical amino acid length of 894 residues and a protein mass of 101.3 kilodaltons, although 3 isoforms have been identified. It is reported to be notably expressed in many tissues, such as the fallopian tube, skeletal muscle, and bronchus. Other names for this target antigen include GLK, MAPKKKK3, and MEKKK 3.