Down syndrome: Comments and reflections on the 50th anniversary of Lejeune's discovery

Abstract excerpt

Over the past some 160 years, the study of Down syndrome (DS) went from early efforts of differentiating it from cretinism (Séguin) to its establishment as a specific nosologic category of mental deficiency (Down) and subsequent attempts to infer its cause. DS was known to be an overwhelmingly sporadic disorder, concordant in MZ and discordant in DZ twins and associated with increased maternal reproductive age...

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