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[[File:Davpdk2-7216a1e4-f283-448a-8ecf-689985e43c20.png|thumb|220x220px|The XXYY syndrome flag.<ref>https://www.deviantart.com/pride-flags/art/XXYY-Syndrome-657913826</ref>]][[File:Xxyy.png|thumb|218x218px|Alternate XXYY syndrome flag.]]
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▲:''Not to be confused with [[XXXYY Syndrome]], [[XXYYY Syndrome]], or [[XYY Syndrome]].''
'''XXYY''' or '''48,XXYY syndrome''' or '''48,XXYY''' is a rare [[CTM]] [[intersex]] variation occurring in approximately 1 in 18,000 to 1 in 40,000 people [[Assigned Gender|assigned male at birth]].<ref>https://ghr.nlm.nih.gov/condition/48xxyy-syndrome#</ref> It is a chromosomal variation that causes them to have an extra X and an extra Y chromosome (XXYY). It may be considered a variant of [[Klinefelter Syndrome|Klinefelter syndrome]].
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