- Fibroblast growth factor (FGF) homologous factors: new members of the FGF family implicated in nervous system development. Smallwood, P.M., Munoz-Sanjuan, I., Tong, P., Macke, J.P., Hendry, S.H., Gilbert, D.J., Copeland, N.G., Jenkins, N.A., Nathans, J. Proc. Natl. Acad. Sci. U.S.A. (1996)