Heparin Binding Growth Factor Class I, also known as HBGF-1, refers to a class of proteins that possess the ability to bind to heparin. These proteins are considered essential in various biological processes, including cell proliferation, tissue repair, and embryonic development. Synonyms for HBGF-1 include HBGFA, heparin-binding growth factor 1, and fibroblast growth factor 4 (FGF-4). The latter synonym highlights the role of FGF-4, a specific member of the HBGF-1 class, in stimulating fibroblast proliferation and promoting wound healing. These synonyms are useful in scientific discussions and research, aiding in the understanding and characterization of this critical group of growth factors.