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[[File:Xyyyy.png|thumb|The XYYYY Syndrome flag.]]
'''49,XYYYY''' '''syndrome''' is a rare [[intersex]] variation in which an [[CTM]] individual has three extra Y chromosomes instead of just the usual one. It is estimated to occur in 1 in 1,000,000 [[AMAB|DMAB]] children. Due to the rarity, little is known about this variation.
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