Ready-to-use ELISA kits are available for the detection of Fibroblast Growth Factor 15, an alias of the protein, fibroblast growth factor 19. The official gene symbol is FGF19. The protein, with a mass of 24 kDa and length of 216 residues, is reported to be secreted. It is a member of the Heparin-binding growth factors family and may be known by other names, including: FGF-19.