Phosphorylated SHC1 links FGFR to Grb2 (Klint et al. 1995) leading to the formation of a signaling complex including Shc, Grb2 and Sos. Transformation of NIH 3T3 cells with v-Src produced a strong constitutive association of FGFR1 with Shc, Grb2 and Sos (Curto et al. 1998) suggesting Src involvement. Recruitment of Grb2-Sos links FGFR to the Ras pathway.