https://www.mayoclinic.org/diseases-conditions/down-syndrome/symptoms-causes/syc-20355977
https://www.mayoclinic.org/diseases-conditions/down-syndrome/symptoms-causes/syc-20355977
WWW.MAYOCLINIC.ORG
Down syndrome - Symptoms and causes
Down syndrome is a genetic disorder caused when abnormal cell division results in extra genetic material from chromosome 21.
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