Anti-metastin antibodies enable researchers to detect and measure the metastin antigen in biological samples. This target is a reported synonym of the KISS1 gene, which encodes KiSS-1 metastasis suppressor. This protein is known to function in cytoskeleton organization and GPCR signaling pathways, among other biological roles. The human version of metastin has a canonical amino acid length of 138 residues and a protein mass of 14.7 kilodaltons. It is reported to be a secreted protein that is notably expressed in the placenta and testis. Other names for this target antigen include HH13, metastasis-suppressor KiSS-1, and kisspeptin-1.