Heparin-bindinggrowthfactor1isaproteinthatinhumansisencodedbytheFGF1gene.Theproteinencodedbythisgeneisamemberofthefibroblastgrowthfactor(FGF)family.Thisproteinfunctionsasamodifierofendothelialcellmigrationandproliferation,aswellasanangiogenicfactor.Itactsasamitogenforavarietyofmesoderm-andneuroectoderm-derivedcellsinvitro,thusisthoughttobeinvolvedinorganogenesis.TheFGF1genewasmappedtochromosome5q31.3-q33.2byinsituhybridization.