The G1 checkpoint checks cell size, nutrients, growth factors, and DNA damage before S phase; failure directs the cell to G0.
The G1 checkpoint, at the end of G1, checks cell size, nutrients, growth factors, and DNA damage; passing allows DNA replication, while failing leads to G0.
| Front | State where G1 checkpoint occurs, what is checked at the checkpoint and what happens if cell passes/fails. |
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| Back | G1 checkpoint - at the end of G1 phase before entry into S phase
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