Methods: the chromosome were prepared with direct method, brief culture of cells and R-banding techniques, and the karyotypic analysis was performed on the base of complex classification.
方法：采用直接法、短期培养法和R显带技术制备染色体，根据复杂分类法进行染色体核型分析。
2
Methods Chromosome specimens were prepared by short term culture of bone marrow cells and karyotype analyses were carried out using R and G banding techniques.