honeypot link
Brought to you by
about MSD
MSD careers
research
worldwide
skip to main content
skip to main content
Professional
Consumer
MSD Manual
Consumer Version
HEALTH TOPICS
HEALTHY LIVING
SYMPTOMS
EMERGENCIES
RESOURCES
NEWS
ABOUT US
Home
/
Images
/
Down Syndrome: Trisomy 21
/
Down Syndrome: Trisomy 21
Down Syndrome: Trisomy 21
People with Down syndrome have an extra chromosome 21.
In these topics
Down Syndrome (Trisomy 21)