Anti-GST4 antibodies enable researchers to detect and measure the GST4 antigen in biological samples. This target is a reported synonym of the GSTM2 gene, which encodes glutathione S-transferase mu 2. This protein is known to function in muscle contraction, among other biological roles. The human version of GST4 has a canonical amino acid length of 218 residues and a protein mass of 25.7 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the cytoplasm of cells and notably expressed in many tissues, such as the appendix, tonsil, and adrenal gland. GST4 is a member of the Mu protein family.