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  1. Down Syndrome: Symptoms & Causes - Cleveland Clinic

  2. About Down Syndrome - National Human Genome Research …

  3. Down Syndrome - StatPearls - NCBI Bookshelf - National Center …

  4. Dealing With Down Syndrome | Chromosomal Disorders

  5. Down syndrome - Symptoms and causes - Mayo Clinic

  6. Genetics of Down syndrome - Wikipedia

  7. Genetic Factors and Inheritance Patterns of Hereditary Down Syndrome

  8. Down syndrome: an insight of the disease” - PubMed Central …

  9. Genetics of Down Syndrome - IntechOpen