GRB2-associated-binding protein 2 also known as GAB2 is a protein that in humans is encoded by the GAB2 gene. GAB2 is a docking protein with a conserved, folded PH domain attached to the membrane and a large disordered region, which hosts interactions with signaling molecules. It is a member of the GAB/DOS family localized on the internal membrane of the cell. It mediates the interaction between receptor tyrosine kinases (RTKs) and non-RTK receptors serving as the gateway into the cell for activation of SHP2, Phosphatidylinositol 3-kinase (PI3K), Grb2, ERK, and AKT and acting as one of the first steps in these signaling pathways. GAB2 has been shown to be important in physiological functions such as growth in bone marrow and cardiac function. GAB2 has also been associated with many disease