Anti-FGF19 antibodies are used in the immunodetection of the protein fibroblast growth factor 19. In humans, the canonical protein has a reported length of 216 amino acid residues and a mass of 24 kDa. It has been described to be a secreted protein. It is reported to be expressed in fetal brain, cartilage, retina, and adult gall bladder. A member of the Heparin-binding growth factors protein family, fgf19 is reported to be involved in suppression of bile acid biosynthesis through down-regulation of CYP7A1 expression, following positive regulation of the JNK and ERK1/2 cascades. FGF19 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. A number of fgf19 antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA and Immunohistochemistry are also common applications.