Anti-Fibulin 1 antibodies are used in the immunodetection of the protein encoded by the FBLN1 gene. In humans, the canonical protein has a reported length of 703 amino acid residues and a mass of 77.2 kDa. Its subcellular localization is in the extracellular matrix and is also secreted. Alternative splicing is reported to yield 4 different isoforms for this protein. A member of the Fibulin protein family, it is known to be involved with extracellular matrix organization and the regulation of gene expression. Post-translational modifications have been described, including glycosylation. Other names for this target antigen include FBLN and FIBL1.