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The protein encoded by the FGF9 gene is a member of the fibroblast growth factor (FGF) family. FGF family members possessbroad mitogenic and cell survival activities, and are involved in a variety of biological processes, includingembryonic development, cell growth, morphogenesis, tissue repair, tumor growth and invasion. This protein was isolatedas a secreted factor that exhibits a growth-stimulating effect on cultured glial cells. In nervous system, thisprotein is produced mainly by neurons and may be important for glial cell development. Expression of the mouse homologof this gene was found to be dependent on Sonic hedgehog (Shh) signaling. Mice lacking the homolog gene displayed amale-to-female sex reversal phenotype, which suggested a role in testicular embryogenesis. (provided by RefSeq)