- Role of basic fibroblast growth factor in the formation of the capillary plexus in the chick embryo chorioallantoic membrane. An in situ hybridization, immunohistochemical and ultrastructural study. Ribatti, D., Bertossi, M., Nico, B., Vacca, A., Ria, R., Riva, A., Roncali, L., Presta, M. J. Submicrosc. Cytol. Pathol. (1998)