- Transformation by pp60src or stimulation of cells with epidermal growth factor induces the stable association of tyrosine-phosphorylated cellular proteins with GTPase-activating protein. Bouton, A.H., Kanner, S.B., Vines, R.R., Wang, H.C., Gibbs, J.B., Parsons, J.T. Mol. Cell. Biol. (1991)