Editing Ontogeny (section)

==== Senescence ====
[[Senescence]] is when cells stop dividing but don't die, but these cells can build up and cause problems in the body.  These cells can release substances that cause inflammation and can damage healthy nearby cells.<ref>{{Cite web |date=2011-02-02 |title=senescence |url=https://www.cancer.gov/publications/dictionaries/cancer-terms/def/senescence |access-date=2022-04-28 |work=NCI's Dictionary of Cancer Terms |publisher=National Cancer Institute |language=en}}</ref> Senescence can be induced by un-repaired DNA damage (e.g., from radiation,<ref>{{Cite journal |last1=Borrego-Soto |first1=Gissela |last2=Ortiz-López |first2=Rocío |last3=Rojas-Martínez |first3=Augusto |date=2015 |title=Ionizing radiation-induced DNA injury and damage detection in patients with breast cancer |journal=Genetics and Molecular Biology |volume=38 |issue=4 |pages=420–432 |doi=10.1590/S1415-475738420150019 |pmc=4763322 |pmid=26692152 }}</ref> old age, etc.) or other cellular stress<ref>{{cite journal |last1=Narita |first1=M |title=Cellular senescence and chromatin organisation |journal=British Journal of Cancer |date=March 2007 |volume=96 |issue=5 |pages=686–691 |doi=10.1038/sj.bjc.6603636 |pmid=17311013 |pmc=2360064 }}</ref> and also is the state of being old.<ref>{{Cite web |title=Definition of SENESCENCE |url=https://www.merriam-webster.com/dictionary/senescence |access-date=2022-04-28 |website=www.merriam-webster.com |language=en}}</ref>