Anti-EIF3-p40 antibodies enable researchers to detect and measure the EIF3-p40 antigen in biological samples. This target is a reported synonym of the EIF3H gene, which encodes eukaryotic translation initiation factor 3 subunit H. This protein is a known component of the eukaryotic translation initiation factor 3 (eIF-3) complex, which is required for several steps in the initiation of protein synthesis. The human version of EIF3-p40 has a canonical amino acid length of 352 residues and a protein mass of 39.9 kilodaltons. It is reported to be localized in the cytoplasm of cells and widely expressed in many tissue types. Other names for this target antigen include EIF3S3, eIF3-gamma, and eIF3-p40.