print email comment close National Institute of Child Health & Human Development: Down Syndrome URL: http://www.nichd.nih.gov/health/topics/Down_Syndrome.cfm Description: Fact sheet about Down syndrome, a "set of mental and physical symptoms that result from having an extra copy of Chromosome 21." Discusses signs and symptoms of Down syndrome, treatment, and who is at risk. Includes links to related information, including a basic explanation of chromosomes. From the National Institutes of Health. Publisher: National Institute of Child Health & Human Development, National Institutes of Health LII Database Information: Record 22734 created by Jennifer English on 10/09/2006 Last modification on 10/10/2006 Published: 10/12/2006   Funding agency: California State Library LII Item ID: http://lii.org/cs/lii/view/item/22734