Anti-Interferon regulatory factor 4 antibodies are directed against the protein encoded by the gene IRF4 in humans. The gene may also be known as MUM1, LSIRF, NF-EM5, SHEP8, lymphocyte-specific interferon regulatory factor, and multiple myeloma oncogene 1. Structurally, the protein is reported to be 51.8 kilodaltons in mass. Based on gene name, canine, porcine, monkey, mouse and rat orthologs may also be found. Anti-Interferon regulatory factor 4 antibodies are directed against the protein encoded by the gene IRF4 in humans. The gene may also be known as MUM1, LSIRF, NF-EM5, SHEP8, lymphocyte-specific interferon regulatory factor, and multiple myeloma oncogene 1. Structurally, the protein is reported to be 51.8 kilodaltons in mass. Based on gene name, canine, porcine, monkey, mouse and rat orthologs may also be found.