Klinefeltersyndrome is still the most common chromosomal disease, balanced translocation accounts for largest proportion of autosomal abnormality.
克氏症仍是最常见的染色体疾病，染色体平衡易位核型占常染色体异常核型比例最大。
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There was an important significance for early diagnosis of Klinefeltersyndrome, examination of X-chromatin on oral epithelial cell of patients. It was necessary to generally examine male neonate.