Phospho-protein levels in WT and Mx1-Cre, Kras^G12D bone marrows. After 2 hours of serum starvation, total bone marrow cells were stimulated with GM-CSF, serum, or both for 10, 30, or 60 minutes. The cells were lysed and Western blotting was performed. Signal intensity normalized to actin is indicated below each panel, using arbitrary units. The figure shows representative data from 11 independent experiments.