Down Syndrome One of the most common genetic defects is Down Syndrome. The story began is 1866, when a physician named John Langdon Down first described a set of children with common features who were distinct from other children, and had mental retardation. Although other people had previously recognized the characteristics of this syndrome, it was Down who first described the condition. At the beginning of his research, he referred to children diagnosed with Down Syndrome …showed first 75 words of 1497 total…

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