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. Binds NGFR, GRB2, PTPN11 and ERK2 (By similarity). Binds FGFR1 and NTRK1. Phosphorylated on tyrosine residues upon stimulation by BFGF or NGFB. Phosphorylated by ULK2 in vitro.