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GRB2 bound to CD28 is active. 2 / 2
2 |

"In this study, we demonstrate that the co-stimulatory antigen cd28 binds to grb-2 by means of a cytoplasmic pymnm motif, which is the same motif bound by pi 3-kinase."

"Binding of the py site in cd28 (py-m-n-m) by pi3k and grb2 through their sh2 domains is a key step that triggers the cd28 signal transduction for t cell activation and differentiation"