The Gab1 docking protein links the b cell antigen receptor to the phosphatidylinositol 3-kinase/Akt signaling pathway and to the SHP2 tyrosine phosphatase.
Ingham RJ, Santos L, Dang-Lawson M, Holgado-Madruga M, Dudek P, Maroun CR, Wong AJ, Matsuuchi L, Gold MR, J Biol Chem, 2001 Apr 13 - link

The Gab1 protein is a docking site for multiple proteins involved in signaling by the B cell antigen receptor.
Ingham RJ, Holgado-Madruga M, Siu C, Wong AJ, Gold MR, J Biol Chem, 1998 Nov 13 - link