Anti-F11 antibodies are used in the immunodetection of the protein coagulation factor XI. In humans, the canonical protein has a reported length of 625 amino acid residues and a mass of 70.1 kDa. It has been described to be a secreted protein. Up to 2 different isoforms have been reported for this protein. A member of the Peptidase S1 protein family, F11 is known to be involved with proteolysis. Post-translational modifications have been described, including N-glycosylation. The F11 gene has been associated with the disease, Factor XI deficiency. Synonyms for this target antigen include PTA, coagualtion factor XI, plasma thromboplastin antecedent, and FXI. F11 gene orthologs have been reported in the mouse, rat, bovine, chimpanzee and chicken species. A number of F11 antibodies have been mentioned in research publications and have associated citations. ELISA is a widely used application for these antibodies. In addition, Western Blot is also a common application.