The first case of 49, XXXXY syndrome was reported in the 1970s, and it is one of the rarest sex chromosome disorders. Visit The Focus Foundation site for more information.
Androgen Treatment Center
The Focus Foundation
820 W Central Ave #190 -, Davidsonville, Maryland, United States 21035
https://thefocusfoundation.org/x-y-chromosomal-variations/xxxxy/
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