Restriction Point

The restriction point (R) is a point in G1 of the animal cell cycle at which the cell becomes “committed” to the cell cycle, after which extracellular proliferation stimulants are no longer required.

Read more about Restriction Point:  History of The Restriction Point, Extracellular Signals and The Restriction Point, Restriction-point Mechanism, Dynamics, The Restriction Point in Cancer

Famous quotes containing the words restriction and/or point:

    If we can find a principle to guide us in the handling of the child between nine and eighteen months, we can see that we need to allow enough opportunity for handling and investigation of objects to further intellectual development and just enough restriction required for family harmony and for the safety of the child.
    Selma H. Fraiberg (20th century)

    The lifelong process of caregiving, is the ultimate link between caregivers of all ages. You and I are not just in a phase we will outgrow. This is life—birth, death, and everything in between.... The care continuum is the cycle of life turning full circle in each of our lives. And what we learn when we spoon-feed our babies will echo in our ears as we feed our parents. The point is not to be done. The point is to be ready to do again.
    Paula C. Lowe (20th century)