Anti-FCMR antibodies are used in the immunodetection of the protein Fc mu receptor. In humans, the canonical protein has a reported length of 390 amino acid residues and a mass of 43.1 kDa. It has been described to be a secreted protein. Up to 3 different isoforms have been reported for this protein. It is reported to be expressed in lymph nodes, peripheral blood leukocytes, lung, thymus and kidneys. FCMR is believed to play a role in the immune system processes. Synonyms for this target antigen include FcmuR, TOSO, fas apoptotic inhibitory molecule 3, Fc fragment of IgM receptor, IgM Fc fragment receptor, and FAIM3. FCMR gene orthologs have been reported in the mouse, rat, bovine and chimpanzee species. Some FCMR antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. In addition, ELISA is also a common application.