How do cells know when to stop morphogenesis once the correct head shape has been achieved?

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  "context": "Key unsolved problem in regenerative biology; no existing molecular model predicts stop signals or final form specification in collective morphogenesis.",
  "norm_label": "How do cells know when to stop morphogenesis once the correct head shape has been achieved?",
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  "source_location": "§6, L123-L127",
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