I've asked this question, specifically because i've seen this question.

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As we see in this diagram , G0 phase occurs after M phase and at a specific point within G1 phase.

Is there a meaning to saying "end" in this case?

What is the checkpoint for causing a cell to enter G0 instead of continuing with the cell cycle, in case of heart cells and neurons? (what exactly is "checked"?).

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    $\begingroup$ Regarding when, I would answer at the end of Mitosis (check also this link: biology.stackexchange.com/questions/70323/… ). I wouldn't know what to answer to your second question, but maybe the link I posted above will help. $\endgroup$ – Fabio Marroni Sep 26 '20 at 15:36

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