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Mosaic trisomy 21
- ... cells. In these people, the condition is called mosaic Down syndrome. Researchers believe that having extra copies of genes ... 21, which causes Down syndrome.Like trisomy 21, mosaic Down syndrome is not inherited. It occurs as a random ...
- ... Screening (BUN) Study Group. First-trimester screening for trisomies 21 and 18. N Engl J Med. 2003 Oct 9;349(15):1405-13. doi: 10.1056/NEJMoa025273. Citation on PubMed ... of fetal trisomy 18 through abnormal sonographic features. J Ultrasound Med. ...