The retinoblastoma (Rb)protein controls progression into S phase by regulating ________ activity.

Name: The retinoblastoma (Rb)protein controls progression into S phase by regulating ________ activity.
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The retinoblastoma (Rb) protein controls progression into the S phase by regulating E2F activity. Rb binds to E2F, inhibiting its ability to act as a transcription factor for genes essential for S phase entry, thus acting as a checkpoint in cell cycle progression.

The Retinoblastoma (Rb)protein Controls Progression into S Phase by Regulating