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When comparing with hair that grow forever after we cut it, why eyebrow not. what gene measure current length of eyebrow so it stop to grow after specific length.

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    $\begingroup$ no gene measures the length, all hair grows for a period of time then goes dormant, eyebrow hair just grows for a much shorter period of time and grows slower. even head hair stops growing after a few (2-7) years. en.wikipedia.org/wiki/Human_hair_growth for more detail on the genetics You can start here ncbi.nlm.nih.gov/pubmed/5173315 $\endgroup$ – John Apr 18 at 13:56
  • $\begingroup$ If we cut it in the middle and in the base, why it regrow to the same length after all. I mean If we cut it in the base then it's need more time to regrow than if we cut it in the middle. But how gene determined this? $\endgroup$ – Mohammad Fajar Apr 25 at 8:17
  • $\begingroup$ short answer, It doesn't $\endgroup$ – John Apr 25 at 12:32

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