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先天愚型(Down’s Syndrome DS)是一种常见的染色体疾病。患者染色体组包含一条额外21号染色体。根据21号染色体的变异情况,分为标准型(Standard DS,SDS)、嵌合型(MosaicDS,MDS)和易位型(Translccation DS,
Down’s Syndrome DS is a common chromosomal disorder. The patient genome contains an extra chromosome 21. According to the variation of chromosome 21, it was divided into Standard DS (SDS), MosaicDS (MDS) and Translocation Cation