• A Parent's View of Klinefelter Syndrome
• Chromosomal Mosaicism (TRISOMY X OR Y MOSAICISM (47,XXX, 47,XXY, 47,XYY))
  
• French Association for Chromosomal Conditions including Klinefelter Syndrome 
  
• Klinefelter Syndrome & Gynecomastia
• Klinefelter Syndrome of Rhode Island
• Klinefelter Syndrome and Me
• Klinefelter Syndrome - The Ohio Support Network
• Klinefelter Syndrome - An XXY Legacy
• Klinefelter Syndrome and Its Variants 
  
• Klinefelter Syndrome of Texas 
  
• Netherlands Klinefelter Site 
  
• The Littlest Warrior 
  
• The XXYY Project (XXYY Syndrome) 
• Understanding Klinefelter Syndrome
• 49,XXXXY Syndrome Website
• Neurodevelopmental Diagnostic Center for Young Children (NDCYC) 
  

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Last updated on May 10, 2008