What is down syndrome?

Chromosomal Abnormalities: Trisomy 21 (Down Syndrome), NCBDDD

Facts, Myths, & Truths About Down Syndrome

About Down Syndrome National Down Syndrome Society (NDSS)

Down Syndrome Inspiration Center

What is Down Syndrome? - OrbRom Center

Blood Diseases & Down Syndrome National Down Syndrome Society (NDSS)

Down Syndrome : Symptoms, Causes and Diagnosis

Restoring a key hormone could help people with Down syndrome, Science

Kids with Down syndrome represent in NYC, Kids Who Make SA Great

What causes Down syndrome? NICHD - Eunice Kennedy Shriver National Institute of Child Health and Human Development