Editing Polyploidy (section)

==== Endopolyploidy ====
Polyploidy occurs in some tissues of animals that are otherwise diploid, such as human [[muscle]] tissues.<ref name="pmid19571289">{{cite journal | vauthors = Parmacek MS, Epstein JA | title = Cardiomyocyte renewal | journal = The New England Journal of Medicine | volume = 361 | issue = 1 | pages = 86–88 | date = July 2009 | pmid = 19571289 | pmc = 4111249 | doi = 10.1056/NEJMcibr0903347 }}</ref> This is known as '''endopolyploidy'''. Species whose cells do not have nuclei, that is, [[prokaryotes]], may be polyploid, as seen in the large [[bacterium]] ''[[Epulopiscium fishelsoni]]''.<ref>{{cite journal | vauthors = Mendell JE, Clements KD, Choat JH, Angert ER | title = Extreme polyploidy in a large bacterium | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 105 | issue = 18 | pages = 6730–6734 | date = May 2008 | pmid = 18445653 | pmc = 2373351 | doi = 10.1073/pnas.0707522105 | doi-access = free | bibcode = 2008PNAS..105.6730M }}</ref> Hence [[ploidy]] is defined with respect to a cell.