Anti-GT-1 antibodies enable researchers to detect and measure the GT-1 antigen in biological samples. This target is a reported synonym of the MYL4 gene, which encodes myosin light chain 4. This protein is known to function in muscle contraction, among other biological roles. The human version of GT-1 has a canonical amino acid length of 197 residues and a protein mass of 21.6 kilodaltons. It is reported to be notably expressed in the heart muscle.