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3 Cards in this Set

  • Front
  • Back

Four reasons why two cells might have a differential response to signalling molecule

Exposure to different levels of the molecule


Differential expression of receptor for the molecule


Different expression of intercellular molecules needed to transduce the signal


Differential exposure to an inhibitory molecule

How does p21 inhibit the cell cycle

It binds to and thereby inactivated cyclin-Cdk complexes

Definition of a stem cell

Undifferentiated cell that divides asymmetrically to give rise to two different progeny