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[[File:Tetrasomy x.png|thumb|200x200px|The tetrasomy X flag.]]
'''Tetrasomy X''', '''XXXX syndrome''', '''quadruple X''', or '''48,XXXX''' is an [[intersex]] variation that occurs in [[AFAB]]/[[CTF]] individuals, in which they are born with four X chromosomes rather than only the expected two. It appears to be rare, as approximately 100 cases have been reported worldwide, however there may be unspoken cases of the past, as
The traits that usually come along with this variation is often very similar to traits within the [[Triple X Syndrome|triple X syndrome.]] They often are born with epicanthal folds, flat nasal bridges, a small mouth or underdeveloped face, delayed or absent teeth, enamel defects, joint and [[Secondary Sex Agenesis|muscle tone abnormalities]], spine and hip abnormalities, and are often taller than average. They may also have an abnormal nervous system, abnormal hearing/vision, abnormal circulatory systems, and abnormal kidneys.
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