YY syndrome in an American Negro.
D044383:Black People; D002648:Child; D002869:Chromosome Aberrations; D006801:Humans; D007223:Infant; D007621:Karyotyping; D008297:Male; D012729:Sex Chromosome Aberrations / Q000453:epidemiology*; D012730:Sex Chromosomes; D014481:United States; D001741:Black or African American