- Trisomy 13 (1)
- Trisomy 18 (1)
- Trisomy 21@ (48)
- The Chromosome 18 Registry and Research Society is a lay advocacy organization whose mission is to help individuals with chromosome 18 abnormalities overcome the obstacles they face so they might lead happy, healthy and productive lives.www.chromosome18.org
- Providing support to parents with newborns affected with trisomy 13 and other chromosome disorders ...michaelsfeat.org