BEF is a reported alias of the human protein 'Aly/REF export factor', encoded by the gene ALYREF. Anti-BEF antibodies are available from several suppliers. The full protein is reported to be 257 amino acid residues in length. Based on antigen name, there may be canine, porcine, monkey, mouse and rat variants of this protein. See the antibody supplier page for important details, including specific immunogenicity and validated applications.