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World Down Syndrome Day (WDSD) is marked each year on March 21,[1] beginning in 2006. The 21st day of March (the 3rd month of the year) was selected to signify the uniqueness of the triplication (trisomy) of the 21st chromosome which causes Down syndrome.
References[edit]- ^ "Getting ready for World Down Syndrome Day 2020 - 21/03/2020 00:00:00". Down Syndrome International.
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