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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. Down syndrome - Symptoms and causes - Mayo Clinic

  5. Dealing With Down Syndrome | Chromosomal Disorders

  6. Genetics of Down syndrome - Wikipedia

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

  8. Down syndrome | Definition, Chromosome, Symptoms, Causes,

  9. Down syndrome - PubMed

  10. Down syndrome - Nature Reviews Disease Primers