The American Association for Klinefelter Syndrome
Information and Support
AAKSIS is a national volunteer association with the mission of education, support, research, and understanding of 47 XXY and its variants, collectively known as Klinefelter syndrome... click for more information
The Child Psychiatry Branch of the National Institute of Mental Health is conducting a study of the effects of sex chromosomes on brain development. If you would like information on participating in this study, please see the NIMH website for the
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