Tip II topoizomeraza — разлика између измена
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[[Датотека:Gyr.PNG|right|thumb|250px|Struktura 42 -{KDa}- fragmenta -{N}--terminalne ATPaze DNK giraze koja je homologna sa svim drugim tipovima IIA topoizomeraza.]]
'''Tip II [[topoizomeraza|topoizomeraze]]''' presecaju ova lanca DNK heliksa simultano radi upravljanja zamršenjem DNK i supernamotavanjima.<ref name="pmid11395412">{{cite journal | author = Champoux JJ | title = DNA topoisomerases: structure, function, and mechanism | journal = Annu. Rev. Biochem. | volume = 70 | issue = | pages = 369–413 | year = 2001 | pmid = 11395412 | doi = 10.1146/annurev.biochem.70.1.369 | url = | issn = }}</ref><ref name="urlNational Academy of Sciences: NAS Award in Molecular Biology">{{cite web | url = http://www.nasonline.org/site/PageServer?pagename=AWARDS_molbio | title = National Academy of Sciences: NAS Award in Molecular Biology | author = | authorlink = | coauthors = | date = | format = | work = | publisher = National Academy of Science | pages = | language = | archiveurl = | archivedate = | quote = | accessdate =
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