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Dr. Down (A), Down's grandson and daughter (B), Dr. Lejeune (C), and an image of a Down syndrome karyotype indicating the extra copy of chromosome 21 (pink arrow) (D). Image credits: (A) Wikipedia, (B) photo courtesy of Global Down Syndrome Foundation, (C) reproduced with permission from the Jerome Lejeune Foundation, and (D) @prayersforbabyfinn webpage.
