Fibroblast growth factor-17( FGF17) is one of the fibroblast growth factor( FGF) family members and it makes up FGF8 subfamily along with FGF8 and FGF18. Mature human FGF17 shares 99% aa identity with mouse, rat, porcine and canine FGF17. The FGF domain of FGF17 shares the most aa identity with FGF8 (~75%) and FGF18 (~64%). Among different members of the FGF family, FGF17 and FGF8 share high sequence homology and have similar patterns of expression during embryogenesis. FGF17 is also expressed in adult bovine ovarian follicles and the human prostate, and its expression is increased by both benign hypertrophy and cancer of the prostate.