http://ghr.nlm.nih.gov/condition/48xxyy-syndrome http://ghr.nlm.nih.gov/condition/48xxyy-syndrome Genetics Home Reference: 48,XXYY syndrome Genetics Home Reference (GHR) Genetics Home Reference (GHR) Genetics Home Reference: 48,XXYY syndrome Genetics Home Reference (GHR) Genetics Home Reference (GHR) http://ghr.nlm.nih.gov/condition/48xxyy-syndrome Genetics Home Reference (GHR) http://ghr.nlm.nih.gov/condition/48xxyy-syndrome http://ghr.nlm.nih.gov/condition/48xxyy-syndrome Genetics Home Reference (GHR) Genetics Home Reference (GHR) Genetics Home Reference (GHR) Genetics Home Reference (GHR) Genetics Home Reference (GHR) http://ghr.nlm.nih.gov/condition/48xxyy-syndrome