Syncytin 1 is a reported alias of the human protein 'endogenous retrovirus group W member 1, envelope', encoded by the gene ERVW-1. Anti-Syncytin 1 antibodies are available from several suppliers. The full protein is reported to be 538 amino acid residues in length. Based on antigen name, there may be plant and monkey variants of this protein. See the antibody supplier page for important details, including specific immunogenicity and validated applications.