Not long after FGF1 and FGF2 were isolated, another group of investigators isolated a pair of heparin-binding growth factors that they named HBGF-1 and HBGF-2, while a third group isolated a pair of growth factors that caused proliferation of cells in a bioassay containing blood vessel endothelium cells, which they called ECGF1 and ECGF2.
Pouco despois illáronse FGF1 e FGF2, outro grupo de investigadores illaron un par de factores de crecemento que se ligan á heparina, que denominaron HBGF-1 e HBGF-2, mentres que un terceiro grupo illou un par de factores de crecemento que causaban a proliferación celular nun bioensaio que contiña células endoteliais dos vasos sanguíneos, que denominaron ECGF1 e ECGF2.