. "Reviewed: Xu, W, 2011-11-11"^^ . "Edited: Matthews, L, 2011-11-07"^^ . "Reviewed: Neckers, LM, 2011-11-11"^^ . "Authored: Orlic-Milacic, M, 2011-11-04"^^ . "SOS1 bound to GRB2 in complex with any of the phosphorylated ERBB2:ERBB4 heterodimers catalyzes guanyl-nucleotide exchange on RAS, leading to the activation of the MAP kinase cascade."^^ . . . . . . "RAS guanyl nucleotide exchange mediated by SOS1 bound to GRB2 in complex with phosphorylated ERBB4:ERBB2 heterodimers"^^ . . . . .