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RbBP5, retinoblastoma binding protein 5, belongs to a highly conserved subfamily of WD proteins and contains 6 WD repeats. It binds preferentially to underphosphorylated retinoblastoma protein, which is involved in the control of cell proliferation. RbBP5 is a component of the SET1 complex and of MLL containing complexes. RbBP5 is phosphorylated in response to DNA damage, probably by ATM/ATR.