Fibroblast Growth Factors-8a (FGF-8a) is a 23.5 kDa member of the fibroblast Growth Factors with 204 amino acid residues. FGF-8 is an important role in the regulation of embryonic development, cell proliferation, cell differentiation and cell migration. In embryogenesis function, FGF8 is necessary in limb, brain, eye and ear formation.