Anti-Fibronectin antibodies are protein reagents that detect specific antigens. The Fibronectin antigen is another term for the human protein fibronectin 1, encoded by the FN1 gene. The protein is known to function in angiogenesis and cell adhesion, among other biological roles. Canonically, it has an amino acid length of 2477 residues and a mass of 272.3 kilodaltons. Its subcellular localization is in the extracellular matrix and is secreted. It is reported to be expressed in the inner limiting membrane and around blood vessels in the retina. Other alias names for Fibronectin include CIG, ED-B, and FINC.