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Original Article
Extrachromosome 21 in Korean with Down Syndrome Using DNA Haplotyping
Jin-Sung Lee, Won Kyu Choi
Clin Exp Pediatr. 1997;40(7):917-924.   Published online July 15, 1997
Purpose : Down syndrome, the most common single cause of mental retardation, is usually due to meiotic nondisjunction leading to trisomy 21. In order to understand the mechanisms of meiotic nondisjunction including parental origin of an extrachromosome and the meiotic stage of nondisjunction, we have studied DNA polymorphisms at loci on the long arm of chromosome 21 in 36 families with free trisomy 21. Methods...


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