Download Stem Cells

What are cyclins and why are they important?
­Cyclins are a protein in a cell
­Cyclins regulate the timing of
the cell cycle in eukaryotic cells.
Explain two different types of cyclins. What jobs do they do in the cell?
Internal regulators: Allow the
cell cycle to proceed only when
certain processes have been
carried out.
External Regulators: Direct cells to speed
up or slow down the cell cycle
depending on events outside
the cell
Feb 14­12:29 PM
Feb 14­12:29 PM
What happens when cell growth is unregulated?
Cells divide uncontrollably
Form tumors that can
damage the surrounding
tissues
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Feb 14­12:29 PM
Stem Cells
Every cell in your body was produced
by mitosis from a small number of stem cells.
Unspecialized Cells
They have the potential to differentiate
Feb 14­12:28 PM
Dec 11­10:25 AM