Fibroblast growth factors (FGFs) are members of a large family of structurally related heparin binding polypeptides (17-38kD) that are potent physiological regulators of growth and differentiation for a wide variety of cells of mesodermal, ectodermal and endodermal origin. FGFs are substantially involved in normal development, wound healing and repair, angiogenesis, a variety of neurotrophic activities, in hematopoiesis as well as in tissue remodeling and maintenance. They have also been implicated in pathological conditions such as tumorigenesis and metastasis. The FGF family consists of at least seventeen members designated FGF1 through FGF17. To date, four genes encoding for high affinity cell surface FGF receptors (FGFRs) have been identified: FGFR1 [flg, cek-1], FGFR2 [bek, cek-3], FGFR3 [cek-2] and FGFR4. Multiple additional variants (isoforms) arising by alternative splicing have been reported.