Biology / Bio 0879 · Atom · ~20 seconds
The G1 Checkpoint
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The G1 checkpoint is where a cell irreversibly commits to division, checking cell size, energy reserves, and DNA damage before allowing entry into S phase.
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A cell failing the G1 checkpoint's damage check can pause to repair it or exit into quiescent G0.
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Passing the G1 checkpoint is irreversible — a cell does not reverse course once past this gate.