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Alternate Name(s): Trisomy 21 ...... Down syndrome is a chromosome abnormality, usually due to an extra copy of the 21st chromosome. This syndrome usually, although not always, results in mental retardation and other conditions.
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www.nlm.nih.gov/medlineplus/ency/article/000997.htm#Def...
www.nlm.nih.gov/medlineplus/ency/article/000997.htm#Definition
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A description of Trisomy 21 (Down syndrome) by Len Leshin, M.D., F.A.A.P. ... Trisomy 21: The Story of Down Syndrome ... Three to four percent of all cases of trisomy 21 are due to Robertsonian Translocation. In this case, two breaks occur in separate chromosomes, usually the 14th and 21st chromosomes. There is rearrangement of...
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www.ds-health.com/trisomy.htm
www.ds-health.com/trisomy.htm
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Down syndrome - Wikipedia, the free encyclopedia
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Down syndrome (the most common term in US English), Down's syndrome (standard in the rest of the English-speaking world), trisomy 21 , or trisomy G is a chromosomal disorder caused by the prese...
en.wikipedia.org/wiki/Down_syndrome
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Cincinnati Children's Hospital Medical Center provides information about Down Syndrome (Trisomy 21) and its characteristics, problems, signs, treatment, prognosis information and pediatric specialists. ... Tests to diagnose congenital heart disease in babies with Trisomy 21...
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www.cincinnatichildrens.org/health/heart-encyclopedia/d...
www.cincinnatichildrens.org/health/heart-encyclopedia/disease/syndrome/down.htm
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Detailed information on trisomy 21, also called Down syndrome, including cause, diagnosis, prevention, and research ... Ninety-five percent of Down syndrome results from trisomy 21. Occasionally, the extra chromosome 21 or a portion of it is attached to another chromosome in the egg or sperm; this may result in what is...
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www.healthsystem.virginia.edu/UVAHealth/peds_genetics/d...
www.healthsystem.virginia.edu/UVAHealth/peds_genetics/downs.cfm
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The incidence of Down's syndrome in the general population is 1/700 births. When the maternal age exceeds 35 years, the incidence is 1/274 births. ... This constellation of findings is highly suggestive of trisomy 21.
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brighamrad.harvard.edu/Cases/bwh/hcache/185/full.html
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In trisomy 21 and mosaic trisomy 21, Down syndrome occurs because some or all of the cells have 47 chromosomes, including three chromosomes 21. However, approximately 3%-4% of individuals with Down syndrome have cells containing 46 chromosomes, but still have the features associated with Down syndrome.
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www.medicinenet.com/down_syndrome/article.htm
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