Anti-gamma-glutamyl transpeptidase antibodies enable researchers to detect and measure the gamma-glutamyl transpeptidase antigen in biological samples. This target is a reported synonym of the GGTLC1 gene, which encodes gamma-glutamyltransferase light chain 1. The human version of gamma-glutamyl transpeptidase has a canonical amino acid length of 225 residues and a protein mass of 24.3 kilodaltons. Other names for this target antigen include glutathione hydrolase light chain 1 and gamma-glutamyl transpeptidase.