Editing SOS response (section)

==Cyanobacteria==

[[Cyanobacteria]], the only [[prokaryote]]s capable of oxygen evolving [[photosynthesis]], are major producers of the Earth’s oxygenic atmosphere.<ref>{{cite journal |last1=Hamilton |first1=Trinity L. |last2=Bryant |first2=Donald A. |last3=Macalady |first3=Jennifer L. |title=The role of biology in planetary evolution: cyanobacterial primary production in low-oxygen Proterozoic oceans |journal=Environmental Microbiology |date=February 2016 |volume=18 |issue=2 |pages=325–340 |doi=10.1111/1462-2920.13118 |pmid=26549614 |pmc=5019231}}</ref> The marine cyanobacteria ''[[Prochlorococcus]]'' and ''[[Synechococcus]]'' appear to have an ''E. coli'' like SOS system for repair of DNA, since they encode genes homologous to key ''E. coli'' SOS genes such as ''[[Repressor LexA|lexA]]'' and ''sulA''.<ref>{{cite journal |last1=Cassier-Chauvat |first1=Corinne |last2=Veaudor |first2=Théo |last3=Chauvat |first3=Franck |title=Comparative Genomics of DNA Recombination and Repair in Cyanobacteria: Biotechnological Implications |journal=Frontiers in Microbiology |date=9 November 2016 |volume=7 |page=1809 |doi=10.3389/fmicb.2016.01809 |pmid=27881980 |pmc=5101192 |doi-access=free}}</ref>