Adapter protein that links FGF and NGF receptors to downstream signaling pathways. Involved in the activation of MAP kinases. Down-regulates ERK2 signaling by interfering with the phosphorylation and nuclear translocation of ERK2 (By similarity). Binds NTRK1, FGFR1, NGFR, GRB2, PTPN11 and ERK2. Phosphorylated on tyrosine residues upon stimulation by BFGF or NGFB.