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主页 > 词条 > 塞尔维亚 (SR) > Даунов синдром
Даунов синдром
The most common chromosomal abnormality, Down syndrome results when a fetus has an extra copy of chromosome number 21. It causes mild to severe mental retardation, as well as other physical problems such as heart defects.
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- 行业/领域: 育儿
- 类别 怀孕
- Company: Everyday Health
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