1 8 “Down Syndrome”   “Trisomy 21”

Gene 46 23 21

Sarah Palin John McCain   Down Syndrome

Down Syndrome 2526 Down Syndrome 25 56

Down Syndrome Alzheimer’s

National Down Syndrome 25 % 35 Alzheimer’s 65

Down Syndrome Down Syndrome

Down Syndrome 350,000 Down Syndrome 35 1 1,000  40 Sarah Palin 44 1 35