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ING2 is similar to ING1, a tumor suppressor protein that can bind TP53, inhibit cell growth, and induce apoptosis. This protein binds phosphoinositides (PtdInPs) at its plant homeodomain (PHD) domain and it acts as a PtdInPs receptor. PtdInPs binding regulates the ability of this protein to activate TP53 and TP53-dependent apoptosis.