Methylation of two Homo sapiens-specific X-Y homologous genes in Klinefelter's syndrome (XXY). - Ross, N; Wadekar, R; Lopes, A; Dagnall, A; Close, J; Delisi, L; Crow, T (American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics, 2006)