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The retinoblastoma protein, prb, is a tumor-suppressor protein that controls the g1/s cell-cycle checkpoint. while prb is present in all phases of the cell cycle, regulation of its activity is important in the progression from g1 phase to s phase. sort each statement depending on whether it is is true of cells that remain at the g1 checkpoint or of cells that progress from g1 to s phase.1. prb phosphorylated 2. prb not phosphorylated 3. prb bound to e2f 4. prb not bound to e2f 5. e2f bound to dna 6. cdk4 bound to cyclin d1
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The retinoblastoma protein, prb, is a tumor-suppressor protein that controls the g1/s cell-cycle che...
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