NCIt definition : A protein complex comprised of two epidermal growth factor receptor (EGFR) family
proteins, and one or two growth factor receptor-bound protein 2 (GRB2) adaptor proteins.
These complexes form after epidermal growth factor (EGF) family ligands bind to EGFR
proteins. Ligand binding triggers receptor dimerization and cross-receptor tyrosine
phosphorylation, which allows the SH2 domains of each growth factor receptor-bound
protein 2 to form a non-covalent bond with the phosphorylated EGFR proteins.;