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A Case of Unusual (1q;21q) Translocation Down Syndrome Inherited from a t(1q;21q) Balanced Carrier Mother
Dong Hoon Yi, Jae Ock Park, Sang Mann Shin, You Kyoung Lee, Won Bae Kim, Won Bae Lee, Sung Sup Park, Han-Ik Cho
Clin Exp Pediatr. 1997;40(8):1156-1161.   Published online August 15, 1997
Down syndrome is the most common autosomal syndrome in man. The incidence of trisomy 21 due to translocation is about 3.5-5%. Translocations are usually centric fusions between a 21 and a D group (54.2%) or a G group (40.9%) chromosome. Since the short arm of 21 carries no phenotypically active genes, even if the short arm of 21 is lost, usually there is...


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