Healing

==Genetics==
Many genes play a role in healing.<ref>{{cite journal| pmc=21719 | pmid=9751744 | volume=95 | title=Genetic analysis of a mammalian wound-healing trait |vauthors=McBrearty BA, Clark LD, Zhang XM, Blankenhorn EP, Heber-Katz E| journal=Proc Natl Acad Sci U S A | year=1998 | issue=20 | pages=11792–7 | doi=10.1073/pnas.95.20.11792| bibcode=1998PNAS...9511792M | doi-access=free }}</ref> For instance, in wound healing, P21 has been found to allow mammals to heal spontaneously. It even allows some mammals (like mice) to heal wounds without scars.<ref>{{Cite web|url=http://www.theguardian.com/science/2010/mar/15/mice-genetics-p21-heal-no-scar|title=Genetic discovery promises healing without scars|date=March 15, 2010|website=the Guardian}}</ref><ref>{{Cite journal|title=Lack of p21 expression links cell cycle control and appendage regeneration in mice|first1=Khamilia|last1=Bedelbaeva|first2=Andrew|last2=Snyder|first3=Dmitri|last3=Gourevitch|first4=Lise|last4=Clark|first5=Xiang-Ming|last5=Zhang|first6=John|last6=Leferovich|first7=James M.|last7=Cheverud|first8=Paul|last8=Lieberman|first9=Ellen|last9=Heber-Katz|date=March 30, 2010|journal=Proceedings of the National Academy of Sciences|volume=107|issue=13|pages=5845–5850|doi=10.1073/pnas.1000830107|pmid=20231440|pmc=2851923|bibcode=2010PNAS..107.5845B|doi-access=free}}</ref> The [[LIN28]] gene also plays a role in wound healing. It is dormant in most mammals.<ref>{{Cite web|url=https://www.scientificamerican.com/article/new-limb-regeneration-ins/|title=New Limb Regeneration Insight Surprises Scientists|first=Dina Fine|last=Maron|website=Scientific American}}</ref> Also, the proteins [[MG53]] and [[TGF beta 1]] play important roles in wound healing.<ref>{{Cite web|url=https://www.sciencedaily.com/releases/2016/03/160302135149.htm|title=Gene identified that helps wound healing: New research on gene that regulates healing and may control scarring|website=ScienceDaily}}</ref>